Archer C7 V5 - Reverting to stock not working

Hi Everyone,

I want to revert to stock firmware, but I haven't been successful so far.

TFTP recognized the firmware file, but it gives a timeout around 30-50% with the following error:
"Waiting for Ack Block #9340"

I've tried the following firmware:
Archer C7(EU)_V5_210519
Archer C7(US)_V5_211022

I followed the instructions here:
DD-WRT :: View topic - TP-LINK Archer C7 V4 EU revert to stock
[OpenWrt Wiki] TP-Link Archer C7 AC1750

Any idea why it keeps timing out?

Anyone here can help me somehow?

try putting a switch between the TFTP host and the router, replace the ethernet cable too.

I forgot to mention. Flashing Open-WRT again does seem to work fine in TFTP. Should I still try your recommendations?