HP Pro 3500 MT typically uses a (8MB) or 25Q32FVSIG (4MB) SPI flash chip located near the CMOS battery.
, the raw binary image must be extracted from these packages. It is critical to match the "SSID" (System Board ID) found on a sticker on the motherboard (e.g., 2ABN) to the correct binary version; flashing an incorrect SSID image will result in a permanent brick. The Hardware Recovery Process The manual fix requires a USB programmer, such as the
HP distributes BIOS updates as .exe files (e.g., sp79824.exe ). You can extract the BIN using 7-Zip and a hex editor, but the file is often padded and needs to be trimmed to exactly the chip size. Unless you know the offset, this is risky.
sudo flashrom -p ch341a_spi -w 3500MT.bin