TL-MR6400 v5 back to stock firmware

[max.bilo]

Could you please share the info to restore original firmware TL-MR6400 V5.
Actually the router is not booting (all led blinking) and I am ready to use the serial interface to restore, but it is missing the amount of data to remove from original bin file firmware.
thanks

[frollic]

try 257 bytes.

MR6400 V4 Bricked

@walminahe #MR6400 v4 tp link sim router. walminahe this happened to me too. but luckily after searching i stumbled upon how to fix it. the whole process must be followed right from the start. like step 1) make sure u plug internet cable in mr 6400 wan port .2 installing open wrt with the recovery.bin image.. via flashin those steps u must b knowing....tftp with 192.168.1.255......3. opkg update 3 after update dont install luci yet. 4) use sysupgrade with linking it to the upgrade file url http:…

[ansid]

I tryed dd if="TL-MR6400v5_1.1.0_0.9.1_up_boot(200511)_2020-05-11_12.28.03.bin" of=tp_recovery.bin skip 257 bs=512 and this tp_recovery does not helps

[max.bilo]

I contacted the help support of TP-Link and they answer it is not possible to revert to original firmware. If you found a way to restore please share it, actually my router is not working because I was unable to use the lte modem with openwrt.

[ansid]

We need full dump from flash chip of the good working router. And we need to find man with soldering station and chip programmator

[slh]

@ansid

dd if="TL-MR6400v5_1.1.0_0.9.1_up_boot(200511)_2020-05-11_12.28.03.bin" of=tp_recovery.bin skip 257 bs=512

Warning, I'm explicitly not saying that the below would be correct and not brick your device, I simply don't know it and its particular firmware requirements, but skip 257 would be a syntax error (should be skip=257).

[ansid]

It normally flashes to openwrt ufter bad flashing to cropped stock firmware, I have checked it

[robje]

Try bs=512 skip=1 count=16000
This makes offset for LZMA compressed data (found using binwalk) the same for TL-MR6400v5_1.1.0_0.9.1_up_boot(200511)_2020-05-11_12.28.03.bin and openwrt-ramips-mt76x8-tplink_tl-mr6400-v5-squashfs-tftp-recovery.bin.

[max.bilo]

You are Great!!!!
IT WORKS!!!
I also tried to check with binwalk...but without success, many thanks.

I repeat the complete procedure, it could be usefull for someone else.

• Download the firmware from TP-Link website https://static.tp-link.com/2020/202011/20201116/TL-MR6400(EU)_V5_200511.zip, unzip the file and rename the TL-MR6400v5_1.1.0_0.9.1_up_boot(200511)_2020-05-11_12.28.03.bin file into original.bin

• prepare the file using the command dd if=original.bin of=tp_recover.bin skip=1 bs=512 count=16000

• setup yout PC ethernet card with IP 192.168.0.225, sub: 255.255.255.0

• connect the router to PC with ethernet cable

• open TFTP sw, choose the folder where copied tp_recover.bin file and select the ethernet card
  

  

• switch off the router

• press and keep pressed the WPS/RESET button

• switch on the router and continue keep pressed the WPS/RESET button until the file transfer start

• release the button and wait for router restart

• Restore the PC ethernet card to receive IP address from DHCP (router has address 192.168.1.1)

The router now has been restore to stock firmware.