I am still working on re-flashing my bios. My mii-10000 board has SST 39SF020A bios chip(same as Matute's bios chip). I have found same chip on a dead motherboard and tried hotflash with similar mainboard using
uniflash .
Uniflash has many command line options. One of them is CHIPLIST option which is used for to identify the bios chip. I have identified hex number BFB6 for this SST chip using CHIPLIST option. When I flash the bios image to the chip, it failed at the end of the process. This part of the process is about writing the boot block. So, you need to disable write protect option of the original bios before flashing the any bios chip. You have two option for this which depends on the mainboard used. Some mainboards have jumper for write protection but some of them has bios option. My mainboard has bios option. Although I disabled write protection from bios, it seems that this option is not disable write protect. So, I still could not manage flash my bios chip.
I tried flash my original mii-10000 bios using same steps but the result was the same. If I can find a similar mainboard which has jumper to disable write protection of bios, I'll try flashing again.