OK, I flashed it on other PC with Uniflash.. It said it's all right, Bios ver: X2 4977, but XBox don't boot, it has following symptom: XBOX BOOTS TWICE ON THE THIRD BOOT THE POWER LED IS FLASHING RED AND GREEN (FRAGGING)... Xbox ver 1.2. I've got bios from #XBins(ftp distribution.xbins.org) it was in Multiver folder. What shouls i do?

EDIT: Ah, yes! Chip was 512k Flashrom(AMD') and bios is 256k... Also Chip became very hot while flashing and there were some errors, but after some tries flashing passed OK... But! Maybe this bios don't support 1.2 Xbox???