Asus RT-N66U back to original firmware

Hi,
How to back to original firmware on Asus RT-N66U?

I tried Luci and Asus rescue.
I only managed to bring it to failsafe mode.

On old instruction

is specified to cut the first Bytes
How do I determine how many bits need to be removed?

Thx!

What happens when you try to use Asus firmware rescue?

https://www.asus.com/support/FAQ/1000814/

Do you have a USB TTL cable to connect to the serial console to see what's going on

Which file are you using to revert to stock?

After update router boot only rescue mode
Recover
I tried with Asus original and Merlin firmware.
Router works now, only with OpenWRT firmware

If you use a console cable you'll be able to see what's stopping the flash. Do you have one of these?

I didn't go inside the router, I wouldn't want to get there

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