Chinese motherboard BIOS flash locked after flash

So I have a JINGSHA X79 v1.1.

Details here: https://xeon-e5450.ru/socket-2011/mother...-x79-v0-1/

I flashed the mod BIOS but now flashing is locked:

"the host cpu does not have write access to the target flash area"

I tried BCLK_SEL jumper on board and disable Intel ME. No luck.

Can anyone help? It seems that this was intentional by whoever made the original BIOS, someone named Aleksey Dankov.

Also, Russian is not my native language so I missed the part where it says "An important nuance: after flashing the modified version, the native bios can only be returned by the programmer."