Note 20 Ultra sm-n985f

[Blackjack20]

hello all,
i have an sm-n985f (demo unit) 3 years now , rooted and all the
needed stuf to work like normal one. I had android 11 cause it worked
with the box i work to fix its imei.
i wanted to jump to android 12 these days and it supported until may 2022.
i flashed older firmwares than may 22 and all went fine.
the problem i had was the certification patch wasn't working properly and i tried different firmware versions until i couldn't flash patched AP anymore (the same i could 1 day before).
I searched the reason and i found out that OEM unlock wasn't showing anymore , i tried to lock bootloader and re unlock it but... i couldn't unlock it because KNOX Guard triggered and i can't see OEM Unlock anymore.
I tried to down grade to 11 i had previously and its the same thing ,
device has imei ,its boot locked like its normal but without certificate , so network doesn't work.
Sorry for long post, just wanted to provide as many info i could.
If anyone can suggest anything or had similar issue ,please share with me .
Thanks.

[manule]

Finally erased all now frp

Phone say no