Netgear 4300V2 bootlooping

My beloved Netgear 4300V2 is bootlooping after accidental power off. It was running for 40days without restart. How to recover from bootloop now?
It is running OpenWrt 21.03

unless it's completely dead, try nmrpflash

I was thinking serial. but still I will try nmrpflash

which pins is which.

dunno, Recovering bricked WNDR4300V2 might shed some light

@KOA Seems to me you've been around long enough to find your way to the serial section on the wiki entry, no?

It's not immediately clear on the second picture, but if you zoom in you'll see a helpful soul indicated the pinout.

1 Like

Will try nrmp first.
How can I turn check pins with multimeter, router bootlooping?
One thing is sure the pin marked is VCC, but need to find rest of the three pins.

that's what the thread posted explains, in the 2nd post, doesn't it ?

you only need to identify the GND pin, since you already got the 3v3,
TX and RX are just trial and error ...

1 Like

trying nmrp

C:\nmrp>nmrpflash -i -eth1 -f WNDR4300v2
Error accessing file 'WNDR4300v2'.

got this error. Using official firmware. Firmware Version 1.0.0.60

Sorry I was missing .img correct command

nmrpflash -i -eth1 -f WNDR4300v2.img

tried nmrp
still no luck

C:\nmrp>nmrpflash -i net6 -f WNDR4300v2-V1.0.0.26.img
Waiting for Ethernet connection (Ctrl-C to skip).
Advertising NMRP server on net6 ... \
Received configuration request from a0:63:91:89:e6:45.
Sending configuration: 10.164.183.253/24.
Received upload request: filename 'firmware'.
Uploading WNDR4300v2-V1.0.0.26.img ... recvfrom: An existing connection was forcibly closed by the remote host.

serial it is then.

it was mixed with this too

C:\nmrp>nmrpflash -i net6 -f WNDR4300v2-V1.0.0.26.img
Waiting for Ethernet connection (Ctrl-C to skip).
Advertising NMRP server on net6 ... -pcap_sendpacket: send error: PacketSendPacket failed: The I/O operation failed because network media is disconnected or wireless access point is out of range.  (2150891551)

I got these voltages

top most pin 3.3V so I assume it is VCC also marked with a dot.
The second was 2.5V so I assume TX
third one was low voltage I assume RX.
Bottom seems to be ground

as @Borromini said, there's a photo in the wiki, with the pins documented.

it only shows a photos, but I can't get which one of those is GND, TX and RX

yes you can, if you magnify the photo (by clicking on it), as @Borromini wrote.
and you're welcome.

2 Likes

My bad, I was looking at the wrong pic. :man_facepalming: But my assumption was correct.

For clarity I have added the pinout to https://openwrt.org/toh/netgear/wndr4300_v2#serial now.

2 Likes

Got into the serial.
Kernel panic.
what to do next?

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                                                           [ ▒  0▒281▒57]▒▒ri▒▒:▒▒on▒▒le▒▒tt▒▒0]▒▒is▒▒le▒▒
                           [▒▒  ▒▒28▒▒47▒▒18▒▒00▒▒.u▒▒t:▒▒ty▒▒ a▒▒MM▒▒ 0▒▒80▒▒0▒[    0.295050] printk: console [ttyS0] enabled
[    0.295050] printk: console [ttyS0] enabled
[    0.304108] printk: bootconsole [early0] disabled
[    0.304108] printk: bootconsole [early0] disabled
[    0.323984] spi-nand spi0.1: GigaDevice SPI NAND was found.
[    0.329794] spi-nand spi0.1: 128 MiB, block size: 128 KiB, page size: 2048, OB size: 64
[    0.339194] 2 fixed-partitions partitions found on MTD device spi0.1
[    0.345806] Creating 2 MTD partitions on "spi0.1":
[    0.350775] 0x000000000000-0x000000400000 : "kernel"
[    0.360904] 0x000000400000-0x000008000000 : "ubi"
[    0.496066] spi-nor spi0.0: mx25l1606e (2048 Kbytes)
[    0.501292] 8 fixed-partitions partitions found on MTD device spi0.0
[    0.507868] Creating 8 MTD partitions on "spi0.0":
[    0.512830] 0x000000000000-0x000000040000 : "u-boot"
[    0.518818] 0x000000040000-0x000000050000 : "u-boot-env"
[    0.525189] 0x000000050000-0x000000060000 : "caldata_backup"
[    0.531941] 0x000000060000-0x000000070000 : "config"
[    0.537933] 0x000000070000-0x000000080000 : "traffic_meter"
[    0.544581] 0x000000080000-0x000000090000 : "pot"
[    0.550296] 0x000000090000-0x0000001f0000 : "reserved"
[    0.556481] 0x0000001f0000-0x000000200000 : "caldata"
[    1.143323] random: fast init done
[    1.206755] switch0: Atheros AR8337 rev. 2 switch registered on mdio.0
[    1.794822] ag71xx 19000000.eth: connected to PHY at mdio.0:00 [uid=004dd036 driver=Atheros AR8216/AR8236/AR8316]
[    1.806090] eth0: Atheros AG71xx at 0xb9000000, irq 4, mode: sgmii
[    1.815080] NET: Registered protocol family 10
[    1.824805] Segment Routing with IPv6
[    1.828753] NET: Registered protocol family 17
[    1.833440] bridge: filtering via arp/ip/ip6tables is no longer available bydefault. Update your scripts to load br_netfilter if you need this.
[    1.846835] 8021q: 802.1Q VLAN Support v1.8
[    1.853444] PCI host bridge /ahb/pcie-controller@18250000 ranges:
[    1.859810]  MEM 0x0000000012000000..0x0000000013ffffff
[    1.865222]   IO 0x0000000000000000..0x0000000000000000
[    1.870781] PCI host bridge to bus 0000:00
[    1.875046] pci_bus 0000:00: root bus resource [mem 0x12000000-0x13ffffff]
[    1.882154] pci_bus 0000:00: root bus resource [io  0x0000]
[    1.887915] pci_bus 0000:00: root bus resource [??? 0x00000000 flags 0x0]
[    1.894929] pci_bus 0000:00: No busn resource found for root bus, will use [us 00-ff]
[    1.903144] pci 0000:00:00.0: [168c:abcd] type 00 class 0x020000
[    1.909403] pci 0000:00:00.0: reg 0x10: [mem 0x00000000-0x0001ffff 64bit]
[    1.916465] pci 0000:00:00.0: reg 0x30: [mem 0x00000000-0x0000ffff pref]
[    1.923468] pci 0000:00:00.0: supports D1
[    1.927617] pci 0000:00:00.0: PME# supported from D0 D1 D3hot
[    1.934602] pci_bus 0000:00: busn_res: [bus 00-ff] end is updated to 00
[    1.941484] pci 0000:00:00.0: BAR 0: assigned [mem 0x12000000-0x1201ffff 64bt]
[    1.949064] pci 0000:00:00.0: BAR 6: assigned [mem 0x12020000-0x1202ffff pre]
[    1.959293] UBI: auto-attach mtd1
[    1.962782] ubi0: attaching mtd1
[    3.989976] ubi0 warning: 0x803c1d48: valid VID header but corrupted EC headr at PEB 991
[    3.998447] ubi0 error: 0x803c0f70: two LEBs with same sequence number 1379
[    4.005641] eraseblock attaching information dump:
[    4.010594]  ec       2
[    4.013119]  pnum     990
[    4.015825]  lnum     736
[    4.018523]  scrub    0
[    4.021048]  sqnum    1379
[    4.023843] Volume identifier header dump:
[    4.028072]  magic     55424921
[    4.031310]  version   1
[    4.033934]  vol_type  1
[    4.036549]  copy_flag 0
[    4.039158]  compat    0
[    4.041772]  vol_id    1
[    4.044389]  lnum      736
[    4.047178]  data_size 0
[    4.049792]  used_ebs  0
[    4.052408]  data_pad  0
[    4.055018]  sqnum     1379
[    4.057901]  hdr_crc   b55fbc0a
[    4.061144] Volume identifier header hexdump:
[    4.065987] ubi0 error: 0x803b5840: failed to attach mtd1, error -22
[    4.072659] UBI error: cannot attach mtd1
[    4.077438] /dev/root: Can't open blockdev
[    4.081728] VFS: Cannot open root device "(null)" or unknown-block(0,0): errr -6
[    4.089454] Please append a correct "root=" boot option; here are the availale partitions:
[    4.098089] 1f00            4096 mtdblock0
[    4.098091]  (driver?)
[    4.104858] 1f01          126976 mtdblock1
[    4.104861]  (driver?)
[    4.111622] 1f02             256 mtdblock2
[    4.111624]  (driver?)
[    4.118380] 1f03              64 mtdblock3
[    4.118382]  (driver?)
[    4.125143] 1f04              64 mtdblock4
[    4.125145]  (driver?)
[    4.131907] 1f05              64 mtdblock5
[    4.131910]  (driver?)
[    4.138665] 1f06              64 mtdblock6
[    4.138668]  (driver?)
[    4.145429] 1f07              64 mtdblock7
[    4.145431]  (driver?)
[    4.152194] 1f08            1408 mtdblock8
[    4.152196]  (driver?)
[    4.158950] 1f09              64 mtdblock9
[    4.158953]  (driver?)
[    4.165713] Kernel panic - not syncing: VFS: Unable to mount root fs on unknwn-block(0,0)
[    4.174247] Rebooting in 1 seconds..

The UBI is corrupt. I don't know much about UBI but maybe booting the initramfs then running sysupgrade would reformat it?

It looks like you need to choose a different baud rate to see the early boot and interact with the bootloader.


these are my current serial setting