The Fujitsu Esprimo E5625 (mainboard D2724-A1x) bios has only agesa AGESA V126.96.36.199 support. The E5635 (mainboard D2904-A1x) bios has AGESA V188.8.131.52 with microcode patch 1043 to support AMD C3 processors. With the latest bios for the E5625 AMD C3 processors are not supported by Fujitsu. How to proceed: Download the bios for the esprimo E5635 from the fujitsu website. Rename the bup file extension to zip and unpack the archive, Use snipac decompressor from Veit Kennegieser to unpack the ocf file. Delete the first 112 bytes and the last byte from the decompressed ocf file with a hexeditior. You should now have a bios file with 1.048.576 Bytes. Switch to DOS by using a bootable usb stick. Use in DOS the programm flashrom.exe to flash the file with the following command: flashrom --verbose --programmer internal --chip AT26DF081A --write FSCbios.bin >write.log During flashing no flashing onging information or information about a successful flash will appear. To check if flashrom has correct flashed into the bios chip use the "-- read" command and include a bios backup file name as a command for flashrom. The USB stick can be safefly put after reading back the bios while within DOS into a different computer to checkt the result. Additional information: To have a bootable usb stick it is good to use the by fujitsu provided usb stick bios image which creates a 64MB freedos boot drive. The bios update does only work with flashrom. I tried several tools before. I don't know how to modify something in the bios due to the structure does not completely match with the usual phoenix bios structure.