Bios backup software GigaDevice

Hey, i got few days ago my CH341A programmer and want to backup und unlock my BIOS. I have an Gigabyte G5 KF Laptop with and GigaDevice “GD25B256E” BIOS chip.

Tryd so far over 10 Programmers (as programmer, colibri,flashrom, neo programmer…) but no one support this chip. Any idea?

This is the Chip;
Chip Link

Take a look for guidance.