Update FP4 relocked bootloader

Hi community,

I have a FP4 on iodéos beta build 2.4 20220329 FP4. My bootloader was locked after the first install
I want to update to the last build, but i saw the disclaimer about FP4 relocked bootloader.
I understand i have to unlock my bootloader again and lost my data due to the wipe.

But i don’t understand what i have to do after about the avb key, flashin the bin…
Could someone please explain me more with the steps in details, how to flash the key…

Thanks for help.

Nevermind just saw this iodéOS installation - iodé