Macronix MX77U5 chip reading and flashing

[byonatane]

Hello

I'm trying to read and flash a BIOS chip MX77U51250FZ4I42, WSON-8 format.

This chip is not listed in the software yet, any idea how could I proceed?
I attached a picture of the chip.

Thanks for your help !

[ArT]

Could you share datasheet for this chip? I can not google it, maybe chip has crypto registers and datasheet is not publicly available.

What READ ID does it report?

Have you tried to read it as FLASH -> 25 series -> 25...512 [PP] with 1.8V VPP ? Or FLASH -> 25 series -> Macronix -> MX25U51245G