Abnormal operation

Installing and Using OpenWrt
1

I have an old TPLink WR841N. It was working fine as a dumb AP. I have a custom version with no firewall, dhcp, etc.

When i turn it on, it works for some random time then turn off wireless led, turn off web server and start blinking config led. Ping and SSH work fine.

dmesg shows

[    7.947629] eth1: link up (1000Mbps/Full duplex)  ****** but this is a 100Mbps device
[    7.952446] IPv6: ADDRCONF(NETDEV_CHANGE): eth1: link becomes ready
[    8.104237] random: dropbearkey: uninitialized urandom read (32 bytes read)
[    8.113085] random: dropbearkey: uninitialized urandom read (32 bytes read)
[   11.433447] random: dropbearkey: uninitialized urandom read (32 bytes read)
[   11.451338] random: dropbear: uninitialized urandom read (32 bytes read)
[  120.294727] random: crng init done   ***** i don't know what this means.

logread says "Failed to connect to ubus".

If i turn off and on it came to normal (default configuration) and work on default config for some random time again.

What could it be? Hardware problem?

2

The board connection to the switch is probably 1000.

This means the randomization/entropy engine initialized.

Are there any logs related to this?

What config changes did you make?

3

Thank's for your help @lleachii

No. The complete dmesg:

root@OpenWrt:~# dmesg
[    0.000000] Linux version 4.9.214 (buildbot@0d27b924961c) (gcc version 7.3.0 (OpenWrt GCC 7.3.0 r7989-82fbd85747) ) #0 Thu Feb 27 21:25:59 2020
[    0.000000] MyLoader: sysp=8b8b81ac, boardp=96e34c72, parts=b298aa77
[    0.000000] bootconsole [early0] enabled
[    0.000000] CPU0 revision is: 0001974c (MIPS 74Kc)
[    0.000000] SoC: Atheros AR9341 rev 3
[    0.000000] Determined physical RAM map:
[    0.000000]  memory: 02000000 @ 00000000 (usable)
[    0.000000] Initrd not found or empty - disabling initrd
[    0.000000] Primary instruction cache 64kB, VIPT, 4-way, linesize 32 bytes.
[    0.000000] Primary data cache 32kB, 4-way, VIPT, cache aliases, linesize 32 bytes
[    0.000000] Zone ranges:
[    0.000000]   Normal   [mem 0x0000000000000000-0x0000000001ffffff]
[    0.000000] Movable zone start for each node
[    0.000000] Early memory node ranges
[    0.000000]   node   0: [mem 0x0000000000000000-0x0000000001ffffff]
[    0.000000] Initmem setup node 0 [mem 0x0000000000000000-0x0000000001ffffff]
[    0.000000] On node 0 totalpages: 8192
[    0.000000] free_area_init_node: node 0, pgdat 80446ae4, node_mem_map 81000020
[    0.000000]   Normal zone: 64 pages used for memmap
[    0.000000]   Normal zone: 0 pages reserved
[    0.000000]   Normal zone: 8192 pages, LIFO batch:0
[    0.000000] pcpu-alloc: s0 r0 d32768 u32768 alloc=1*32768
[    0.000000] pcpu-alloc: [0] 0
[    0.000000] Built 1 zonelists in Zone order, mobility grouping on.  Total pages: 8128
[    0.000000] Kernel command line:  board=TL-WR841N-v8  console=ttyS0,115200 rootfstype=squashfs noinitrd
[    0.000000] PID hash table entries: 128 (order: -3, 512 bytes)
[    0.000000] Dentry cache hash table entries: 4096 (order: 2, 16384 bytes)
[    0.000000] Inode-cache hash table entries: 2048 (order: 1, 8192 bytes)
[    0.000000] Writing ErrCtl register=00000000
[    0.000000] Readback ErrCtl register=00000000
[    0.000000] Memory: 27604K/32768K available (3408K kernel code, 167K rwdata, 424K rodata, 216K init, 211K bss, 5164K reserved, 0K cma-reserved)
[    0.000000] SLUB: HWalign=32, Order=0-3, MinObjects=0, CPUs=1, Nodes=1
[    0.000000] NR_IRQS:51
[    0.000000] Clocks: CPU:535.000MHz, DDR:400.000MHz, AHB:200.000MHz, Ref:25.000MHz
[    0.000000] clocksource: MIPS: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 7144898866 ns
[    0.000011] sched_clock: 32 bits at 267MHz, resolution 3ns, wraps every 8027976190ns
[    0.008261] Calibrating delay loop... 266.64 BogoMIPS (lpj=1333248)
[    0.091064] pid_max: default: 32768 minimum: 301
[    0.096059] Mount-cache hash table entries: 1024 (order: 0, 4096 bytes)
[    0.103051] Mountpoint-cache hash table entries: 1024 (order: 0, 4096 bytes)
[    0.113802] clocksource: jiffies: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 19112604462750000 ns
[    0.124228] futex hash table entries: 256 (order: -1, 3072 bytes)
[    0.132130] NET: Registered protocol family 16
[    0.138628] MIPS: machine is TP-LINK TL-WR841N/ND v8
[    0.634662] clocksource: Switched to clocksource MIPS
[    0.641304] NET: Registered protocol family 2
[    0.647043] TCP established hash table entries: 1024 (order: 0, 4096 bytes)
[    0.654410] TCP bind hash table entries: 1024 (order: 0, 4096 bytes)
[    0.661181] TCP: Hash tables configured (established 1024 bind 1024)
[    0.668001] UDP hash table entries: 256 (order: 0, 4096 bytes)
[    0.674174] UDP-Lite hash table entries: 256 (order: 0, 4096 bytes)
[    0.681134] NET: Registered protocol family 1
[    0.685811] PCI: CLS 0 bytes, default 32
[    0.690203] Crashlog allocated RAM at address 0x1f00000
[    0.697149] workingset: timestamp_bits=30 max_order=13 bucket_order=0
[    0.712089] squashfs: version 4.0 (2009/01/31) Phillip Lougher
[    0.718291] jffs2: version 2.2 (NAND) (SUMMARY) (LZMA) (RTIME) (CMODE_PRIORITY) (c) 2001-2006 Red Hat, Inc.
[    0.739974] io scheduler noop registered
[    0.744110] io scheduler deadline registered (default)
[    0.750084] Serial: 8250/16550 driver, 16 ports, IRQ sharing enabled
[    0.760011] console [ttyS0] disabled
[    0.783912] serial8250.0: ttyS0 at MMIO 0x18020000 (irq = 11, base_baud = 1562500) is a 16550A
[    0.793036] console [ttyS0] enabled
[    0.800602] bootconsole [early0] disabled
[    0.816673] m25p80 spi0.0: found s25sl032p, expected m25p80
[    0.822450] m25p80 spi0.0: s25sl032p (4096 Kbytes)
[    0.828421] 5 tp-link partitions found on MTD device spi0.0
[    0.834186] Creating 5 MTD partitions on "spi0.0":
[    0.839200] 0x000000000000-0x000000020000 : "u-boot"
[    0.846668] 0x000000020000-0x00000016d8c0 : "kernel"
[    0.854212] 0x00000016d8c0-0x0000003f0000 : "rootfs"
[    0.861309] mtd: device 2 (rootfs) set to be root filesystem
[    0.867269] 1 squashfs-split partitions found on MTD device rootfs
[    0.873668] 0x000000360000-0x0000003f0000 : "rootfs_data"
[    0.881849] 0x0000003f0000-0x000000400000 : "art"
[    0.889214] 0x000000020000-0x0000003f0000 : "firmware"
[    0.898210] libphy: Fixed MDIO Bus: probed
[    0.922648] libphy: ag71xx_mdio: probed
[    1.556766] ag71xx ag71xx.0: connected to PHY at ag71xx-mdio.1:00 [uid=004dd042, driver=Generic PHY]
[    1.567063] eth0: Atheros AG71xx at 0xb9000000, irq 4, mode:MII
[    2.196552] ag71xx-mdio.1: Found an AR934X built-in switch
[    2.248981] eth1: Atheros AG71xx at 0xba000000, irq 5, mode:GMII
[    2.257991] NET: Registered protocol family 10
[    2.268276] NET: Registered protocol family 17
[    2.272934] bridge: filtering via arp/ip/ip6tables is no longer available by default. Update your scripts to load br_netfilter if you need this.
[    2.286501] 8021q: 802.1Q VLAN Support v1.8
[    2.292957] hctosys: unable to open rtc device (rtc0)
[    2.303409] VFS: Mounted root (squashfs filesystem) readonly on device 31:2.
[    2.312180] Freeing unused kernel memory: 216K
[    2.316818] This architecture does not have kernel memory protection.
[    2.554707] random: fast init done
[    3.059612] init: Console is alive
[    3.063387] init: - watchdog -
[    3.739074] kmodloader: loading kernel modules from /etc/modules-boot.d/*
[    3.819152] kmodloader: done loading kernel modules from /etc/modules-boot.d/*
[    3.837714] init: - preinit -
[    4.779810] IPv6: ADDRCONF(NETDEV_UP): eth1: link is not ready
[    4.811068] random: procd: uninitialized urandom read (4 bytes read)
[    7.946242] eth1: link up (1000Mbps/Full duplex)
[    7.951055] IPv6: ADDRCONF(NETDEV_CHANGE): eth1: link becomes ready
[    8.036120] jffs2: notice: (402) jffs2_build_xattr_subsystem: complete building xattr subsystem, 0 of xdatum (0 unchecked, 0 orphan) and 0 of xref (0 dead, 0 orphan) found.
[    8.056545] mount_root: overlay filesystem has not been fully initialized yet
[    8.072628] mount_root: switching to jffs2 overlay
[    8.346888] urandom-seed: Seed file not found (/etc/urandom.seed)
[    8.597021] eth1: link down
[    8.613105] procd: - early -
[    8.617840] procd: - watchdog -
[    9.264814] procd: - watchdog -
[    9.268398] procd: - ubus -
[    9.408688] random: ubusd: uninitialized urandom read (4 bytes read)
[    9.486482] random: ubusd: uninitialized urandom read (4 bytes read)
[    9.493641] random: ubusd: uninitialized urandom read (4 bytes read)
[    9.501483] procd: - init -
[    9.846760] kmodloader: loading kernel modules from /etc/modules.d/*
[    9.855529] Loading modules backported from Linux version wt-2017-11-01-0-gfe248fc2c180
[    9.863804] Backport generated by backports.git v4.14-rc2-1-31-g86cf0e5d
[    9.959661] ath: EEPROM regdomain: 0x0
[    9.959671] ath: EEPROM indicates default country code should be used
[    9.959675] ath: doing EEPROM country->regdmn map search
[    9.959693] ath: country maps to regdmn code: 0x3a
[    9.959699] ath: Country alpha2 being used: US
[    9.959704] ath: Regpair used: 0x3a
[    9.973304] ieee80211 phy0: Selected rate control algorithm 'minstrel_ht'
[    9.978174] ieee80211 phy0: Atheros AR9340 Rev:3 mem=0xb8100000, irq=47
[   10.019630] kmodloader: done loading kernel modules from /etc/modules.d/*
[   11.407206] urandom_read: 5 callbacks suppressed
[   11.407216] random: jshn: uninitialized urandom read (4 bytes read)
[   23.961865] IPv6: ADDRCONF(NETDEV_UP): eth1: link is not ready
[   23.999836] br-lan: port 1(eth1.1) entered blocking state
[   24.005496] br-lan: port 1(eth1.1) entered disabled state
[   24.011543] device eth1.1 entered promiscuous mode
[   24.016567] device eth1 entered promiscuous mode
[   24.116166] IPv6: ADDRCONF(NETDEV_UP): br-lan: link is not ready
[   24.198194] IPv6: ADDRCONF(NETDEV_UP): eth0: link is not ready
[   25.604104] eth1: link up (1000Mbps/Full duplex)
[   25.627851] IPv6: ADDRCONF(NETDEV_CHANGE): eth1: link becomes ready
[   25.644812] br-lan: port 1(eth1.1) entered blocking state
[   25.650409] br-lan: port 1(eth1.1) entered forwarding state
[   25.674908] IPv6: ADDRCONF(NETDEV_CHANGE): br-lan: link becomes ready
[  127.044718] random: crng init done

And logread give me that error: "Failed to connect to ubus". Is there any other way to get some info?

After stars getting these errors, i made a 30/30/30 reset and changed nothing. The most i tried sometimes is to enable wireless, change SSID and enable security. But i got this behaviour even with wifi disabled. And completly random time.

4

Putting this here as known good config of retired TP-Link WR841N ver. 11

@quirino1977 consider purchase of a new DC adaptor..

OpenWrt dmesg and system board.

IMG_20220528_223833__01

https://openwrt.org/toh/hwdata/tp-link/tp-link_tl-wr841n_v11

/etc/config$ ubus call system board
{
	"kernel": "4.9.243",
	"hostname": "OpenWrt",
	"system": "Qualcomm Atheros QCA9533 ver 2 rev 0",
	"model": "TP-Link TL-WR841N\/ND v11",
	"board_name": "tl-wr841n-v11",
	"release": {
		"distribution": "OpenWrt",
		"version": "18.06.9",
		"revision": "r8077-7cbbab7246",
		"target": "ar71xx\/tiny",
		"description": "OpenWrt 18.06.9 r8077-7cbbab7246"
	}
}
/etc/config$ dmesg
[    0.000000] Linux version 4.9.243 (buildbot@d6b0edf6d597) (gcc version 7.3.0 (OpenWrt GCC 7.3.0 r8077-7cbbab7246) ) #0 Wed Nov 11 20:09:58 2020
[    0.000000] MyLoader: sysp=9fb7db5d, boardp=d56f3f67, parts=bfae9f0c
[    0.000000] bootconsole [early0] enabled
[    0.000000] CPU0 revision is: 00019374 (MIPS 24Kc)
[    0.000000] SoC: Qualcomm Atheros QCA9533 ver 2 rev 0
[    0.000000] Determined physical RAM map:
[    0.000000]  memory: 02000000 @ 00000000 (usable)
[    0.000000] Initrd not found or empty - disabling initrd
[    0.000000] Primary instruction cache 64kB, VIPT, 4-way, linesize 32 bytes.
[    0.000000] Primary data cache 32kB, 4-way, VIPT, cache aliases, linesize 32 bytes
[    0.000000] Zone ranges:
[    0.000000]   Normal   [mem 0x0000000000000000-0x0000000001ffffff]
[    0.000000] Movable zone start for each node
[    0.000000] Early memory node ranges
[    0.000000]   node   0: [mem 0x0000000000000000-0x0000000001ffffff]
[    0.000000] Initmem setup node 0 [mem 0x0000000000000000-0x0000000001ffffff]
[    0.000000] On node 0 totalpages: 8192
[    0.000000] free_area_init_node: node 0, pgdat 80446a44, node_mem_map 81000020
[    0.000000]   Normal zone: 64 pages used for memmap
[    0.000000]   Normal zone: 0 pages reserved
[    0.000000]   Normal zone: 8192 pages, LIFO batch:0
[    0.000000] pcpu-alloc: s0 r0 d32768 u32768 alloc=1*32768
[    0.000000] pcpu-alloc: [0] 0 
[    0.000000] Built 1 zonelists in Zone order, mobility grouping on.  Total pages: 8128
[    0.000000] Kernel command line:  board=TL-WR841N-v11  console=ttyS0,115200 rootfstype=squashfs noinitrd
[    0.000000] PID hash table entries: 128 (order: -3, 512 bytes)
[    0.000000] Dentry cache hash table entries: 4096 (order: 2, 16384 bytes)
[    0.000000] Inode-cache hash table entries: 2048 (order: 1, 8192 bytes)
[    0.000000] Writing ErrCtl register=00000000
[    0.000000] Readback ErrCtl register=00000000
[    0.000000] Memory: 27604K/32768K available (3412K kernel code, 163K rwdata, 424K rodata, 216K init, 211K bss, 5164K reserved, 0K cma-reserved)
[    0.000000] SLUB: HWalign=32, Order=0-3, MinObjects=0, CPUs=1, Nodes=1
[    0.000000] NR_IRQS:51
[    0.000000] Clocks: CPU:650.000MHz, DDR:393.603MHz, AHB:216.666MHz, Ref:25.000MHz
[    0.000000] clocksource: MIPS: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 5880801374 ns
[    0.000009] sched_clock: 32 bits at 325MHz, resolution 3ns, wraps every 6607641598ns
[    0.008278] Calibrating delay loop... 432.53 BogoMIPS (lpj=2162688)
[    0.071115] pid_max: default: 32768 minimum: 301
[    0.076101] Mount-cache hash table entries: 1024 (order: 0, 4096 bytes)
[    0.083079] Mountpoint-cache hash table entries: 1024 (order: 0, 4096 bytes)
[    0.093563] clocksource: jiffies: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 19112604462750000 ns
[    0.103966] futex hash table entries: 256 (order: -1, 3072 bytes)
[    0.111812] NET: Registered protocol family 16
[    0.118193] MIPS: machine is TP-LINK TL-WR841N/ND v11
[    0.613678] clocksource: Switched to clocksource MIPS
[    0.620188] NET: Registered protocol family 2
[    0.625813] TCP established hash table entries: 1024 (order: 0, 4096 bytes)
[    0.633175] TCP bind hash table entries: 1024 (order: 0, 4096 bytes)
[    0.639945] TCP: Hash tables configured (established 1024 bind 1024)
[    0.646775] UDP hash table entries: 256 (order: 0, 4096 bytes)
[    0.652946] UDP-Lite hash table entries: 256 (order: 0, 4096 bytes)
[    0.659872] NET: Registered protocol family 1
[    0.664541] PCI: CLS 0 bytes, default 32
[    0.668689] Crashlog allocated RAM at address 0x1f00000
[    0.675642] workingset: timestamp_bits=30 max_order=13 bucket_order=0
[    0.689461] squashfs: version 4.0 (2009/01/31) Phillip Lougher
[    0.695653] jffs2: version 2.2 (NAND) (SUMMARY) (LZMA) (RTIME) (CMODE_PRIORITY) (c) 2001-2006 Red Hat, Inc.
[    0.716792] io scheduler noop registered
[    0.720933] io scheduler deadline registered (default)
[    0.726867] Serial: 8250/16550 driver, 16 ports, IRQ sharing enabled
[    0.736339] console [ttyS0] disabled
[    0.760272] serial8250.0: ttyS0 at MMIO 0x18020000 (irq = 11, base_baud = 1562500) is a 16550A
[    0.769382] console [ttyS0] enabled
[    0.776940] bootconsole [early0] disabled
[    0.792567] m25p80 spi0.0: found gd25q32, expected m25p80
[    0.800473] m25p80 spi0.0: gd25q32 (4096 Kbytes)
[    0.805673] 5 tp-link partitions found on MTD device spi0.0
[    0.811433] Creating 5 MTD partitions on "spi0.0":
[    0.816433] 0x000000000000-0x000000020000 : "u-boot"
[    0.823792] 0x000000020000-0x00000016dde8 : "kernel"
[    0.831216] 0x00000016dde8-0x0000003f0000 : "rootfs"
[    0.838190] mtd: device 2 (rootfs) set to be root filesystem
[    0.844158] 1 squashfs-split partitions found on MTD device rootfs
[    0.850548] 0x0000003a0000-0x0000003f0000 : "rootfs_data"
[    0.858572] 0x0000003f0000-0x000000400000 : "art"
[    0.865822] 0x000000020000-0x0000003f0000 : "firmware"
[    0.874575] libphy: Fixed MDIO Bus: probed
[    0.904389] libphy: ag71xx_mdio: probed
[    1.536231] ag71xx-mdio.1: Found an AR934X built-in switch
[    1.589599] eth0: Atheros AG71xx at 0xba000000, irq 5, mode:GMII
[    2.226632] ag71xx ag71xx.0: connected to PHY at ag71xx-mdio.1:04 [uid=004dd042, driver=Generic PHY]
[    2.236843] eth1: Atheros AG71xx at 0xb9000000, irq 4, mode:MII
[    2.245529] NET: Registered protocol family 10
[    2.255503] NET: Registered protocol family 17
[    2.260154] bridge: filtering via arp/ip/ip6tables is no longer available by default. Update your scripts to load br_netfilter if you need this.
[    2.273726] 8021q: 802.1Q VLAN Support v1.8
[    2.280125] hctosys: unable to open rtc device (rtc0)
[    2.290753] VFS: Mounted root (squashfs filesystem) readonly on device 31:2.
[    2.299599] Freeing unused kernel memory: 216K
[    2.304232] This architecture does not have kernel memory protection.
[    2.533696] random: fast init done
[    2.989247] init: Console is alive
[    2.993015] init: - watchdog -
[    3.835456] kmodloader: loading kernel modules from /etc/modules-boot.d/*
[    3.887982] kmodloader: done loading kernel modules from /etc/modules-boot.d/*
[    3.906574] init: - preinit -
[    4.642036] IPv6: ADDRCONF(NETDEV_UP): eth0: link is not ready
[    4.671335] random: procd: uninitialized urandom read (4 bytes read)
[    6.785816] eth0: link up (1000Mbps/Full duplex)
[    6.790631] IPv6: ADDRCONF(NETDEV_CHANGE): eth0: link becomes ready
[    7.936155] jffs2: notice: (403) jffs2_build_xattr_subsystem: complete building xattr subsystem, 0 of xdatum (0 unchecked, 0 orphan) and 0 of xref (0 dead, 0 orphan) found.
[    7.954065] mount_root: overlay filesystem has not been fully initialized yet
[    7.964573] mount_root: switching to jffs2 overlay
[    7.997808] urandom-seed: Seed file not found (/etc/urandom.seed)
[    8.169505] eth0: link down
[    8.185985] procd: - early -
[    8.189082] procd: - watchdog -
[    8.812826] procd: - watchdog -
[    8.816436] procd: - ubus -
[    8.922707] random: ubusd: uninitialized urandom read (4 bytes read)
[    8.973284] random: ubusd: uninitialized urandom read (4 bytes read)
[    8.980455] random: ubusd: uninitialized urandom read (4 bytes read)
[    8.988062] procd: - init -
[    9.307744] kmodloader: loading kernel modules from /etc/modules.d/*
[    9.319093] ip6_tables: (C) 2000-2006 Netfilter Core Team
[    9.336939] Loading modules backported from Linux version wt-2017-11-01-0-gfe248fc2c180
[    9.345297] Backport generated by backports.git v4.14-rc2-1-31-g86cf0e5d
[    9.355613] ip_tables: (C) 2000-2006 Netfilter Core Team
[    9.370085] nf_conntrack version 0.5.0 (1024 buckets, 4096 max)
[    9.433607] xt_time: kernel timezone is -0000
[    9.500829] PPP generic driver version 2.4.2
[    9.507995] NET: Registered protocol family 24
[    9.559811] ath: EEPROM regdomain: 0x0
[    9.559822] ath: EEPROM indicates default country code should be used
[    9.559826] ath: doing EEPROM country->regdmn map search
[    9.559844] ath: country maps to regdmn code: 0x3a
[    9.559849] ath: Country alpha2 being used: US
[    9.559853] ath: Regpair used: 0x3a
[    9.571550] ieee80211 phy0: Selected rate control algorithm 'minstrel_ht'
[    9.576391] ieee80211 phy0: Atheros AR9531 Rev:2 mem=0xb8100000, irq=47
[    9.684799] kmodloader: done loading kernel modules from /etc/modules.d/*
[   10.972864] urandom_read: 5 callbacks suppressed
[   10.972873] random: jshn: uninitialized urandom read (4 bytes read)
[   25.774487] IPv6: ADDRCONF(NETDEV_UP): eth0: link is not ready
[   25.806404] br-lan: port 1(eth0.1) entered blocking state
[   25.811997] br-lan: port 1(eth0.1) entered disabled state
[   25.818081] device eth0.1 entered promiscuous mode
[   25.823039] device eth0 entered promiscuous mode
[   25.936449] IPv6: ADDRCONF(NETDEV_UP): br-lan: link is not ready
[   26.002596] IPv6: ADDRCONF(NETDEV_UP): eth1: link is not ready
[   27.949922] eth0: link up (1000Mbps/Full duplex)
[   27.981321] IPv6: ADDRCONF(NETDEV_CHANGE): eth0: link becomes ready
[   28.020370] br-lan: port 1(eth0.1) entered blocking state
[   28.026024] br-lan: port 1(eth0.1) entered forwarding state
[   28.079295] IPv6: ADDRCONF(NETDEV_CHANGE): br-lan: link becomes ready
5

It have a "brother" WR741. I will try it's DC adaptor.

Sometimes it reboot completly. Ones just reboot, other "factory reseta". Another "freezes" and stop everything but SSH and ping. And keeps config led blinking. While this:

root@(none):~# ubus call system board
Failed to connect to ubus
6

Yep, and I had the same EXACT message on my working (retired) router, hence the suggestion to look for a DC adaptor.

There are more than a few of us that began our OpenWrt journey on this device. I've owned deployed 5.