Archer C6 bricked?

Hi,

yesterday, I tried doing some updates but there were some critical errors. Therefore I decided reinstalling a new version (via TFTP). After a few trys the router was working again with the newest version of OpenWrt. After I changed a few settings and made a reboot, the router suddenly was not working anymore.

I already tried to reinstall OpenWrt and also the TP-Link factory image, but my router will not work.
My TFTP Server always says, the upload of the file was successful, but that does not help.

When I power on the router, the power led starts blinking after a few seconds and about a minute later, it stops blinking and that‘s it, no more led lighting.
When I connect my Computer to the router, my computer does only get an ipv6 address, but there is no ipv4 address assigned to my computer. Wireshark detects some ICMPv6 and DNS Packets that seem to come from the router...

Can someone help me?

have you tried resetting it?

reset using the reset button:
power board, wait until power led stops blinking
then hold reset button until it is blinking again, let go and wait 5 minutes.

otherwise...

reset button method for booting into failsafe mode:
from the wiki
https://openwrt.org/docs/guide-user/troubleshooting/failsafe_and_factory_reset

Recommended for most users: Wait for a flashing LED and press a button. This is usually the easiest method once you figure out the correct moment.

For most users and most devices, the LEDs now (2018) provide sufficient clues as to timing to be able to avoid older recommendations to “press the XXX button as fast as you can until …” for entering failsafe mode.

There are three different (power) LED blinking speeds during boot for most of the routers:

A power-on sequence of lights that is specific to the device's bootloader
Then a fast 5-per-second blinking rhythm during two seconds, while router waits for user to trigger the failsafe mode, typically by a button press
Then either
A faster, 10-per-second blink if the user pressed a button and failsafe mode was triggered
A slower, 2.5-per-second blink continuing to the end of boot, if the failsafe was not triggered and the normal boot continues

after this you can connect with an SSH client at 192.168.1.1 and issue command firstboot to reset

Hi,
thank you for your help!

I tried the reset and after a reboot, i assigned a static in to my computer. Then I was able to access the router via ssh, but I do not understand why my password is still working, because since I last entered a password, I reinstalled openwrt for a few times... crazy...

Now I have the problem that I always get the message „Bus error“ and df -h says my rom partition is full

Any ideas?

/rom will always be full, this is the read-only root filesystem

all file changes are stored in the JFFS2 partition which is called /overlay

after a factory reset anything you type in password will work

if you select "keep configuration" for a sysupgrade then password is saved

that's not enough information to help...

you can see kernel log with command dmesg
and paste a section of it which includes the error you see
probably there is no problem though

DMESG LOG:

[    0.000000] Linux version 4.14.209 (builder@buildhost) (gcc version 7.5.0 (OpenWrt GCC 7.5.0 r11257-5090152ae3)) #0 Sun Dec 6 07:31:03 2020
[    0.000000] bootconsole [early0] enabled
[    0.000000] CPU0 revision is: 00019750 (MIPS 74Kc)
[    0.000000] MIPS: machine is TP-Link Archer C6 v2
[    0.000000] SoC: Qualcomm Atheros QCA956X ver 1 rev 0
[    0.000000] Determined physical RAM map:
[    0.000000]  memory: 08000000 @ 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 0x0000000000000000-0x0000000007ffffff]
[    0.000000] Movable zone start for each node
[    0.000000] Early memory node ranges
[    0.000000]   node   0: [mem 0x0000000000000000-0x0000000007ffffff]
[    0.000000] Initmem setup node 0 [mem 0x0000000000000000-0x0000000007ffffff]
[    0.000000] On node 0 totalpages: 32768
[    0.000000] free_area_init_node: node 0, pgdat 804fbf80, node_mem_map 81008000
[    0.000000]   Normal zone: 256 pages used for memmap
[    0.000000]   Normal zone: 0 pages reserved
[    0.000000]   Normal zone: 32768 pages, LIFO batch:7
[    0.000000] random: get_random_bytes called from 0x804ff740 with crng_init=0
[    0.000000] pcpu-alloc: s0 r0 d32768 u32768 alloc=1*32768
[    0.000000] pcpu-alloc: [0] 0 
[    0.000000] Built 1 zonelists, mobility grouping on.  Total pages: 32512
[    0.000000] Kernel command line: console=ttyS0,115200n8 rootfstype=squashfs,jffs2
[    0.000000] PID hash table entries: 512 (order: -1, 2048 bytes)
[    0.000000] Dentry cache hash table entries: 16384 (order: 4, 65536 bytes)
[    0.000000] Inode-cache hash table entries: 8192 (order: 3, 32768 bytes)
[    0.000000] Writing ErrCtl register=00000000
[    0.000000] Readback ErrCtl register=00000000
[    0.000000] Memory: 123300K/131072K available (4035K kernel code, 156K rwdata, 532K rodata, 1220K init, 212K bss, 7772K 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] CPU clock: 775.000 MHz
[    0.000000] clocksource: MIPS: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 4932285024 ns
[    0.000007] sched_clock: 32 bits at 387MHz, resolution 2ns, wraps every 5541893118ns
[    0.008230] Calibrating delay loop... 385.84 BogoMIPS (lpj=1929216)
[    0.074772] pid_max: default: 32768 minimum: 301
[    0.079794] Mount-cache hash table entries: 1024 (order: 0, 4096 bytes)
[    0.086776] Mountpoint-cache hash table entries: 1024 (order: 0, 4096 bytes)
[    0.097684] clocksource: jiffies: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 19112604462750000 ns
[    0.108083] futex hash table entries: 256 (order: -1, 3072 bytes)
[    0.114569] pinctrl core: initialized pinctrl subsystem
[    0.122147] NET: Registered protocol family 16
[    0.129611] PCI host bridge /ahb/pcie-controller@18250000 ranges:
[    0.136090]  MEM 0x0000000012000000..0x0000000013ffffff
[    0.141592]   IO 0x0000000000000000..0x0000000000000000
[    0.161447] PCI host bridge to bus 0000:00
[    0.165770] pci_bus 0000:00: root bus resource [mem 0x12000000-0x13ffffff]
[    0.173055] pci_bus 0000:00: root bus resource [io  0x0000]
[    0.178926] pci_bus 0000:00: root bus resource [??? 0x00000000 flags 0x0]
[    0.186087] pci_bus 0000:00: No busn resource found for root bus, will use [bus 00-ff]
[    0.194461] pci 0000:00:00.0: [168c:0056] type 00 class 0x028000
[    0.194516] pci 0000:00:00.0: reg 0x10: [mem 0x00000000-0x001fffff 64bit]
[    0.194637] pci 0000:00:00.0: PME# supported from D0 D3hot
[    0.194808] pci_bus 0000:00: busn_res: [bus 00-ff] end is updated to 00
[    0.194831] pci 0000:00:00.0: BAR 0: assigned [mem 0x12000000-0x121fffff 64bit]
[    0.205190] clocksource: Switched to clocksource MIPS
[    0.211393] NET: Registered protocol family 2
[    0.216761] TCP established hash table entries: 1024 (order: 0, 4096 bytes)
[    0.224108] TCP bind hash table entries: 1024 (order: 0, 4096 bytes)
[    0.230861] TCP: Hash tables configured (established 1024 bind 1024)
[    0.237691] UDP hash table entries: 256 (order: 0, 4096 bytes)
[    0.243859] UDP-Lite hash table entries: 256 (order: 0, 4096 bytes)
[    0.250721] NET: Registered protocol family 1
[    0.255386] PCI: CLS 0 bytes, default 32
[    0.257936] Crashlog allocated RAM at address 0x3f00000
[    0.264593] workingset: timestamp_bits=30 max_order=15 bucket_order=0
[    0.275700] squashfs: version 4.0 (2009/01/31) Phillip Lougher
[    0.281840] jffs2: version 2.2 (NAND) (SUMMARY) (LZMA) (RTIME) (CMODE_PRIORITY) (c) 2001-2006 Red Hat, Inc.
[    0.300539] io scheduler noop registered
[    0.304671] io scheduler deadline registered (default)
[    0.311842] pinctrl-single 1804002c.pinmux: 544 pins at pa b804002c size 68
[    0.320107] Serial: 8250/16550 driver, 16 ports, IRQ sharing enabled
[    0.328888] console [ttyS0] disabled
[    0.332686] 18020000.uart: ttyS0 at MMIO 0x18020000 (irq = 9, base_baud = 1562500) is a 16550A
[    0.341820] console [ttyS0] enabled
[    0.349381] bootconsole [early0] disabled
[    0.374751] m25p80 spi0.0: s25fl064k (8192 Kbytes)
[    0.379789] 5 fixed-partitions partitions found on MTD device spi0.0
[    0.386358] Creating 5 MTD partitions on "spi0.0":
[    0.391309] 0x000000000000-0x000000020000 : "u-boot"
[    0.397129] 0x000000020000-0x000000030000 : "mac"
[    0.402603] 0x000000030000-0x0000007d0000 : "firmware"
[    0.410377] 2 uimage-fw partitions found on MTD device firmware
[    0.416539] Creating 2 MTD partitions on "firmware":
[    0.421671] 0x000000000000-0x000000190000 : "kernel"
[    0.427462] 0x000000190000-0x0000007a0000 : "rootfs"
[    0.433167] mtd: device 4 (rootfs) set to be root filesystem
[    0.439091] 1 squashfs-split partitions found on MTD device rootfs
[    0.445499] 0x000000480000-0x0000007a0000 : "rootfs_data"
[    0.451714] 0x0000007d0000-0x0000007f0000 : "tplink"
[    0.457523] 0x0000007f0000-0x000000800000 : "art"
[    0.463972] libphy: Fixed MDIO Bus: probed
[    1.145551] libphy: ag71xx_mdio: probed
[    1.152514] switch0: Atheros AR8337 rev. 2 switch registered on mdio-bus.0
[    1.806651] ag71xx 19000000.eth: connected to PHY at mdio-bus.0:00 [uid=004dd036, driver=Atheros AR8216/AR8236/AR8316]
[    1.818246] eth0: Atheros AG71xx at 0xb9000000, irq 4, mode: sgmii
[    1.826922] NET: Registered protocol family 10
[    1.836408] Segment Routing with IPv6
[    1.840279] NET: Registered protocol family 17
[    1.844900] bridge: filtering via arp/ip/ip6tables is no longer available by default. Update your scripts to load br_netfilter if you need this.
[    1.858316] 8021q: 802.1Q VLAN Support v1.8
[    1.864035] hctosys: unable to open rtc device (rtc0)
[    1.874517] VFS: Mounted root (squashfs filesystem) readonly on device 31:4.
[    1.888634] Freeing unused kernel memory: 1220K
[    1.893316] This architecture does not have kernel memory protection.
[    2.533462] init: Console is alive
[    2.537230] init: - watchdog -
[    2.565206] random: fast init done
[    3.572248] kmodloader: loading kernel modules from /etc/modules-boot.d/*
[    3.612321] kmodloader: done loading kernel modules from /etc/modules-boot.d/*
[    3.630436] init: - preinit -
[    4.438872] random: jshn: uninitialized urandom read (4 bytes read)
[    4.548263] random: jshn: uninitialized urandom read (4 bytes read)
[    4.717517] random: jshn: uninitialized urandom read (4 bytes read)
[    6.047888] IPv6: ADDRCONF(NETDEV_UP): eth0: link is not ready
[    6.053979] IPv6: ADDRCONF(NETDEV_UP): eth0.1: link is not ready
[    6.094774] urandom_read: 4 callbacks suppressed
[    6.094781] random: procd: uninitialized urandom read (4 bytes read)
[    7.076519] eth0: link up (1000Mbps/Full duplex)
[    7.081372] IPv6: ADDRCONF(NETDEV_CHANGE): eth0: link becomes ready
[    7.088185] IPv6: ADDRCONF(NETDEV_CHANGE): eth0.1: link becomes ready
[    9.260553] mount_root: jffs2 not ready yet, using temporary tmpfs overlay
[    9.288605] urandom-seed: Seed file not found (/etc/urandom.seed)
[    9.377830] eth0: link down
[    9.397393] procd: - early -
[    9.400468] procd: - watchdog -
[   10.017910] procd: - watchdog -
[   10.021434] procd: - ubus -
[   10.081562] random: ubusd: uninitialized urandom read (4 bytes read)
[   10.125721] random: ubusd: uninitialized urandom read (4 bytes read)
[   10.133498] procd: - init -
[   10.650493] kmodloader: loading kernel modules from /etc/modules.d/*
[   10.739927] ip6_tables: (C) 2000-2006 Netfilter Core Team
[   10.762170] Loading modules backported from Linux version v4.19.137-0-gc076c79e03c6
[   10.770125] Backport generated by backports.git v4.19.137-1-0-g60c3a249
[   10.797157] ip_tables: (C) 2000-2006 Netfilter Core Team
[   10.821565] nf_conntrack version 0.5.0 (2048 buckets, 8192 max)
[   10.916014] xt_time: kernel timezone is -0000
[   11.019428] PPP generic driver version 2.4.2
[   11.026035] NET: Registered protocol family 24
[   11.043945] urngd: v1.0.2 started.
[   11.087886] ath10k 4.19 driver, optimized for CT firmware, probing pci device: 0x56.
[   11.106138] PCI: Enabling device 0000:00:00.0 (0000 -> 0002)
[   11.112296] ath10k_pci 0000:00:00.0: pci irq legacy oper_irq_mode 1 irq_mode 0 reset_mode 0
[   11.233638] random: crng init done
[   11.335351] ath10k_pci 0000:00:00.0: Direct firmware load for ath10k/fwcfg-pci-0000:00:00.0.txt failed with error -2
[   11.346251] ath10k_pci 0000:00:00.0: Falling back to user helper
[   11.725857] firmware ath10k!fwcfg-pci-0000:00:00.0.txt: firmware_loading_store: map pages failed
[   11.735177] ath10k_pci 0000:00:00.0: Direct firmware load for ath10k/pre-cal-pci-0000:00:00.0.bin failed with error -2
[   11.746278] ath10k_pci 0000:00:00.0: Falling back to user helper
[   12.283207] ath10k_pci 0000:00:00.0: Direct firmware load for ath10k/QCA9888/hw2.0/ct-firmware-5.bin failed with error -2
[   12.294573] ath10k_pci 0000:00:00.0: Falling back to user helper
[   12.575887] firmware ath10k!QCA9888!hw2.0!ct-firmware-5.bin: firmware_loading_store: map pages failed
[   12.585708] ath10k_pci 0000:00:00.0: Direct firmware load for ath10k/QCA9888/hw2.0/ct-firmware-2.bin failed with error -2
[   12.597063] ath10k_pci 0000:00:00.0: Falling back to user helper
[   12.829443] firmware ath10k!QCA9888!hw2.0!ct-firmware-2.bin: firmware_loading_store: map pages failed
[   12.839267] ath10k_pci 0000:00:00.0: Direct firmware load for ath10k/QCA9888/hw2.0/firmware-6.bin failed with error -2
[   12.850354] ath10k_pci 0000:00:00.0: Falling back to user helper
[   13.026063] firmware ath10k!QCA9888!hw2.0!firmware-6.bin: firmware_loading_store: map pages failed
[   13.616738] ath10k_pci 0000:00:00.0: qca9888 hw2.0 target 0x01000000 chip_id 0x00000000 sub 0000:0000
[   13.626304] ath10k_pci 0000:00:00.0: kconfig debug 0 debugfs 1 tracing 0 dfs 1 testmode 0
[   13.646330] ath10k_pci 0000:00:00.0: firmware ver 10.4b-ct-9888-fW-13-8c5b2baa2 api 5 features mfp,peer-flow-ctrl,txstatus-noack,wmi-10.x-CT,ratemask-CT,regdump-CT,txrate-CT,flush-all-CT,pingpong-CT,ch-regs-CT,nop-CT,set-special-CT,tx-rc-CT,cust-stats-CT,txrate2-CT,beacon-cb-CT,wmi-block-ack-CT,wmi-bcn-rc-CT crc32 cbf49903
[   13.980925] ath10k_pci 0000:00:00.0: failed to fetch board data for bus=pci,bmi-chip-id=0,bmi-board-id=20 from ath10k/QCA9888/hw2.0/board-2.bin
[   13.994720] ath10k_pci 0000:00:00.0: board_file api 1 bmi_id 0:20 crc32 808fabaa
[   16.047016] ath10k_pci 0000:00:00.0: 10.4 wmi init: vdevs: 16  peers: 48  tid: 96
[   16.054756] ath10k_pci 0000:00:00.0: msdu-desc: 2500  skid: 32
[   16.084901] ath10k_pci 0000:00:00.0: wmi print 'P 48/48 V 16 K 144 PH 176 T 186  msdu-desc: 2500  sw-crypt: 0 ct-sta: 0'
[   16.096273] ath10k_pci 0000:00:00.0: wmi print 'free: 114572 iram: 12804 sram: 29508'
[   16.305482] ath10k_pci 0000:00:00.0: htt-ver 2.2 wmi-op 6 htt-op 4 cal pre-cal-file max-sta 32 raw 0 hwcrypto 1
[   16.418006] ath: EEPROM regdomain: 0x0
[   16.418012] ath: EEPROM indicates default country code should be used
[   16.418015] ath: doing EEPROM country->regdmn map search
[   16.418028] ath: country maps to regdmn code: 0x3a
[   16.418033] ath: Country alpha2 being used: US
[   16.418036] ath: Regpair used: 0x3a
[   16.483402] ath: EEPROM regdomain: 0x0
[   16.483411] ath: EEPROM indicates default country code should be used
[   16.483413] ath: doing EEPROM country->regdmn map search
[   16.483426] ath: country maps to regdmn code: 0x3a
[   16.483431] ath: Country alpha2 being used: US
[   16.483434] ath: Regpair used: 0x3a
[   16.496195] ieee80211 phy1: Selected rate control algorithm 'minstrel_ht'
[   16.497744] ieee80211 phy1: Atheros AR9561 Rev:0 mem=0xb8100000, irq=2
[   16.570601] kmodloader: done loading kernel modules from /etc/modules.d/*
[   40.108227] jffs2: notice: (1440) jffs2_build_xattr_subsystem: complete building xattr subsystem, 21 of xdatum (1 unchecked, 18 orphan) and 109 of xref (23 dead, 0 orphan) found.
[   40.147892] IPv6: ADDRCONF(NETDEV_UP): eth0: link is not ready
[   40.185506] br-lan: port 1(eth0.1) entered blocking state
[   40.191091] br-lan: port 1(eth0.1) entered disabled state
[   40.196969] device eth0.1 entered promiscuous mode
[   40.201922] device eth0 entered promiscuous mode
[   40.265178] IPv6: ADDRCONF(NETDEV_UP): br-lan: link is not ready
[   40.317725] IPv6: ADDRCONF(NETDEV_UP): eth0.2: link is not ready
[   41.156884] eth0: link up (1000Mbps/Full duplex)
[   41.161743] IPv6: ADDRCONF(NETDEV_CHANGE): eth0: link becomes ready
[   41.205317] br-lan: port 1(eth0.1) entered blocking state
[   41.210903] br-lan: port 1(eth0.1) entered forwarding state
[   41.216962] IPv6: ADDRCONF(NETDEV_CHANGE): eth0.2: link becomes ready
[   41.289608] IPv6: ADDRCONF(NETDEV_CHANGE): br-lan: link becomes ready
[   42.351140] overlayfs: upper fs does not support tmpfile.

is 5G wifi working?

is it possible you flash the wrong image?

what version Archer C6 exactly?

It is an Archer C6 v2 (EU).

No nothing is working. No Wifi, no WebInterface and every time I try to type in a command I get a Bus Error.
I think the router always resets itself after every reboot, because the ssh hash is always different.
And when I try to flash OpenWRT or the official TP-Link Firmware, the image is not installed because I always get „the old OpenWRT installation“, even though my TFTP Server says the upload was successfull.

take this image

https://downloads.openwrt.org/releases/19.07.5/targets/ath79/generic/openwrt-19.07.5-ath79-generic-tplink_archer-c6-v2-squashfs-sysupgrade.bin

boot failsafe mode with the directions i put above

use scp to move the file to the router
scp /path/to/sysupgrade.bin root@192.168.1.1:/tmp/firmware.bin

login to router with SSH

do a sysupgrade with it
sysupgrade -n /tmp/firmware.bin

Thank you, this did the trick, but I used the same image as before...

I do not understand why I was not able to flash the image via TFTP...

just make sure you wait 5 minutes after TFTP transfer

however in your case I would not trust it anymore unless it is an emergency

just use sysupgrade from now on