My brother asked me that question, but I can't answer it. Scenario: 1. A motherboard with BIOS version e.g. 1201 2. A CPU that is supported since version e.g. 0901 3. A modified BIOS version e.g. 0701 I assume at 3. it makes no difference if the BIOS is modified or not. Procedure: - Flash BIOS 0701 - Update BIOS to 1201 Resume: Is it possible to flash a lower BIOS version than that required by a specific CPU without making the MoBo unusable?