This tutorial is useful for TL-WR840N V 6.20 devices experiencing failed updates or bricked routers that cannot be used.
Tools Link:
Tftpd64: https://pjo2.github.io/tftpd64/
DD: http://www.chrysocome.net/downloads/d...
TP-Link TL-WR840N V 6.20 Firmware: https://www.tp-link.com/id/support/do...
Just copy and paste the command prompt (DD) command:
dd if=original.bin of=tp_recovery.bin bs=512 skip=1