Flashing VA0 bios chip to load dreamshell from SD card.

[SWAT]

Ahh... MX29F1610 it's a JEDEC chip, it's supported experimentally.
Bad_Ad84 asked me to add support for this chip. Since I did not have a suitable configuration, he tested it himself. As far as I remember we had no success, and at some time he has other affairs and stops the testing. The latest version of the code, he never checked, but you did it Unfortunately there is still no success.
If I'll have a suitable configuration, I would have tried to solve this problem. But for now I don't have VA0 board with BIOS mod.
In your case it's doing is dangerous, because you don't have a spare chip and if the current firmware is damaged, you will not be able to boot the console.