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Flash BIOS chips were introduced in motherboards since 1995/1996. At present all motheboards which are sold have their BIOS/UEFI firmware placed on flashable chip; which means it can be upgraded via software flashers.

If you have an old motherboard and are not sure whether the BIOS chip is flashable, take a look at the motherboard, peel the sticker of the BIOS chip and look for the markings below:

BIOS chip model Manufacturer Flashable
Am29F010 AMD 5 volt flash ROM Yes
Am28F010, Am28F010A AMD 12 volt flash ROM Yes
AT28C010, AT28MC010, AT29C010, AT29LC010, AT29MC010 Atmel 5 volt flash ROM Yes
CAT28F010V5, CAT28F010V5I Catalyst 5 volt flash ROM Yes
CAT28F010, CAT28F010I Catalyst 12 volt flash ROM Yes
28F010 Fujitsu 12 volt flash ROM or ISSI 12 volt flash ROM Yes
HN58C1000 Hitachi 5 volt flash ROM Yes
HN28F101, HN29C010, HN29C010B, HN58C1001, HN58V1001 Hitachi 12 volt flash ROM Yes
A28F010, 28F001BX-B, 28F001BX-T, 28F010 Intel 12 volt flash ROM Yes
M5M28F101FP, M5M28F101P, M5M28F101RV, M5M28F101VP Mitsubishi 12 volt flash ROM Yes
MX28F1000 MXIC 12 volt flash ROM Yes
MSM28F101 OKI 12 volt flash ROM Yes
KM29C010 Samsung 5 volt flash ROM Yes
MX28F1000 MXIC 12 volt flash ROM Yes
DQ28C010, DYM28C010, DQM28C010A SEEQ 5 volt flash ROM Yes
DQ47F010, DQ48F010 SEEQ 12 volt flash ROM Yes
M28F010, M28F1001 SGS-Thomson 12 volt flash ROM Yes
28EE011, 29EE010 SST 5 volt flash ROM Yes
PH29EE010 SST ROM Chip - Flashable Yes
TMS29F010 Texas-Instr. 5 volt flash ROM Yes
TMS28F010 Texas-Instr. 12 volt flash ROM Yes
W29EE011 Winbond 5 volt flash ROM Yes
W27F010 Winbond 12 volt flash ROM Yes
X28C010, X28C010I, XM28C010, XM28C010I XICOR 5 volt flash ROM Yes
29LVxxx 3V Flash memory (rare) Yes
28Cxxx EEPROM, similar to Flash memory Yes
27Cxxx 27Cxxx - With window. EPROM: read-only, requires programmer to write and UV to erase. No

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