2CPU Posted 6 hours ago Share Posted 6 hours ago However you need to swap the CPU to one that does not have the Intel e-fuses burned by microcode (happens on the later BIOS for security fixes). Otherwise your R1 will not boot. I had planned an upgrade of the 9900 to 9900K, got one from eBay after confirming the user never updated their BIOS. A flash from 1.27.0 to 1.12.0 worked fine and then I used recovery method to downgrade to 1.3.2 which resulted in no boot. I then swapped to 9900K and system booted with 1.3.2 BIOS. I immediately changed BIOS settings to disable firmware capsule update. Link to comment Share on other sites More sharing options...
2CPU Posted 6 hours ago Author Share Posted 6 hours ago Before the downgrade make sure to backup your data. Link to comment Share on other sites More sharing options...
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