Prebuilt [SFFn] ASRock's DeskMini A300 - Finally!

[ToraSapphire]

has anyone been able to flash an A300M-STX back to the A300 BIOS after crossflashing an X300M-STX BIOS? I'm not able to do so using the MSI utility I used before because I get a secure boot violation error, and changing any BIOS settings causes a soft brick where I have to unplug the CMOS battery to reset it. I have a 4700G in mine and went from A300 BIOS 3.60S to X300 BIOS 2.00.

I figured it out: I had to downgrade from X300M-STX P2.00 to P1.70 to disable Secure Boot, and then use the MSI utility to re-flash A300M-STX P3.60S. Took several hours of brainstorming to come up with that idea. It's super un-intuitive, but it worked for me.

 

[Dr. Nick]

I can not recommend P2.00 or P2.10, both mess up Curve Optimizer and Boost Overdrive, thus P1.90 is recommended for the time being.
With it secure boot works ok, to boot UMAF to change BIOS settings.

 

[HyphenK]

Hello everyone.
My 5600g+A300 with 3.70E BIOS does not fully work - it could enter BIOS setting but was unable to enter Ubuntu.
I had to downgrade to 3400g and now it works fine with 3.70E.
I need some advice from anyone installed 3.70E.