Good morning, I am new to the forum even though I have been following you for a long time. Sorry for the translation, but I don't speak English. I have three x9sci-ln4f boards with the AB problem, one that I have with the freenas working fine. I have done some tests 1. Set BIOS clock to date before 2021 result after system boot, next reboot follows problem AB 2. With a live ubuntu program, the hardware clock with hwclock. Result of restarting problem AB. 3. Remove the BIOS stack. Result on restarting problem AB From the tests performed, the only way to enter BIOS is to restore cmos. Shared BIOS here is not supported by x9sci-ln4f Hope supermicro will update BIOS for all X9 boards; otherwise i will not buy supermicro again