I have two dsl 2750u one is at my home and another one in my shop, i took backup file of one router (config.img) and tried to restore on 2nd router, after that my dsl 2750u got bricked.
no ethernet connection no wifi signal only leds are flashing, i tried different reset methods found on internet but no luck.
Finally i decided to fix it by USB TO TTL method and i connected router to pc by serial and setup everything , and opened putty,
It showed something like this
press 'esc' to enter boot console
ext phy is not found
Copyright Realtek inc
When i pressed ESC key it showed like
<rtl867x>
So i tried entering "e nvram" , "erase nvram" , "nvram erase" but nothing happens.
I'm sure that when entering "reboot" and enter the router reboots
Please help me to erase nvram and fix the firmware