Unbricking RT-AC5300 using Serial

[fearz]

Hello,

I had a similar post on the other forum but no one responded.

I bricked my router to the state where no CFE is working nor the Asus recovery method nor 30/30/30 the router is in a loop of restart every 3 min.

I bought the USB to Serial cable & planning on restoring the original firmware this way but I don't have any command lists to use.

Can anyone provide me with a guide / help file or documentation on how to restore using which tools / commands?

Thanks in advance

 

[RMerlin]

If the bootloader was overwritten, then you can't recover over serial.

 

[fearz]

If the bootloader was overwritten, then you can't recover over serial.

Is there anyway to find out if that happened? & what if it didn't happen, what is the procedure of recovery?

What I did was uploaded a DD-WRT firmware over CFE (WEB) then it got into that state.

 

[RMerlin]

Is there anyway to find out if that happened? & what if it didn't happen, what is the procedure of recovery?

If there's no output over serial, then the bootloader itself was trashed. You would need JTAG support to recover, and I don't know if it's publicly available for that model.