I managed to brick my Asrock X370 Taichi a while ago... I had hoped that a BIOS update would fix some issues that I had, but did not notice that they removed a few things, presumably to free space and add support for newer CPUs. The update (from 6.40 to 7.xx) itself went fine, but unfortunately broke IOMMU groups and maybe more. Downgrading was not an option, I assume to prevent people from installing an older version that is incompatible with their CPU.
I managed to flash an older image with a tool from the BIOS vendor, but apparently messed up some settings and the PC would not even boot anymore. Fortunately, there was a pin header on the board right next to a serial flash chip and after some probing and fiddling with a cheap stm32 board I managed to get it running again.
I might upgrade to a newer CPU soon-ish which will again require the never BIOS version, let's see how that goes...
I managed to flash an older image with a tool from the BIOS vendor, but apparently messed up some settings and the PC would not even boot anymore. Fortunately, there was a pin header on the board right next to a serial flash chip and after some probing and fiddling with a cheap stm32 board I managed to get it running again.
I might upgrade to a newer CPU soon-ish which will again require the never BIOS version, let's see how that goes...