# BIOS image unpacker or extractor

biosdumpfirmware

I want to see unpacked PC BIOS image code. First way which I see is to download BIOS Flash update from vendor, but it is packed. How can I unpack it? Vendors interested are Gigabyte, ASUS, Supermicro, HP. Second way is to dump the current BIOS fully. Can I dump BIOS image while using Windows or Linux?

Example of ASUS 1MB ROM

0000:0000 | 41 53 55 53   54 45 4B 00   00 00 00 00   00 00 00 00 | ASUSTEK.........
0000:0010 | FF FF FF FF   FF FF FF FF   FF FF FF FF   08 C0 01 00 | ЪЪЪЪЪЪЪЪЪЪЪЪ.ю..
0000:0020 | F1 3F 5C A4   08 00 90 CB   FF FF 11 90   00 00 00 00 | Я?\╓..░кЪЪ.░....
0000:0030 | 01 00 00 00   07 0A 00 00   08 20 09 04   7A 06 01 00 | ......... ..z...
0000:0040 | 5A 7F 06 83   01 00 00 00   11 00 00 00   D0 1F 00 00 | Z..┐........п...
0000:0050 | 00 20 00 00   00 00 00 00   00 00 00 00   00 00 00 00 | . ..............
0000:0060 | 00 00 00 00   A1 00 00 00   01 00 02 00   07 0A 00 00 | ....║...........
0000:0070 | 1A 00 00 00   00 00 00 A4   08 04 08 20   01 04 00 00 | .......╓... ....
0000:0080 | 01 00 00 00   7A 06 01 00   00 00 00 00   00 00 00 00 | ....z...........
0000:0090 | 00 00 00 00   00 00 00 00   00 00 00 00   00 00 00 00 | ................
0000:00A0 | 00 00 00 00   00 00 00 00   00 00 00 00   00 00 00 00 | ................
0000:00B0 | 00 00 00 00   00 00 00 00   00 00 00 00   00 00 00 00 | ................
0000:00C0 | 66 48 29 C4   14 A1 20 3E   9C F1 87 83   AA 14 FB DA | fH)д.║ >°Я┤┐╙.Шз
0000:00D0 | 09 83 A3 33   EA F8 B0 68   00 B2 20 2A   9E AA C7 CD | .┐ё3ЙЬ╟h.╡ *·╙гм
0000:00E0 | C7 E7 0C 17   05 C7 27 D7   A5 1B 9B 01   29 4A 41 E0 | гГ...г'в╔.⌡.)JAЮ
0000:00F0 | 58 54 D4 57   11 A4 A8 26   66 D9 AA 9F   B0 C8 5E 09 | XTтW.╓╗&fы╙÷╟х^.
0000:0100 | 2A 7C 3A 08   0F C7 CF 17   A8 78 8E 3C   19 C4 18 CE | *|:..го.╗x▌<.д.н
0000:0110 | B7 DE 2D 5F   71 5D C9 C9   16 51 7A 43   D0 3A 25 E0 | ╥ч-_q]ии.QzCп:%Ю


This looks not like ready-to-disassemble code (just checked, there are a wild mix of fp and int machine codes). Maybe it is encrypted?