disabling amd prochot with moded bios.

[vorajeeah]

Hi.

I have an asus m513u laptop with ryzen 5 5500u cpu. 

For some reason the prochot flag is set and the cpu throttles to 400mhz when a good battery is installed. On ac without the battery, the cpu is fine.
I have an old battery that does not hold charge, when installed the cpu is fine.

I bought a new battery thinking the good battery was the problem, but I had the same issue. I updated the bios with the new battery installed and the problem went away. however when I then replaced it with good battery (not the battery that does not hold charge). the cpu throttle started again. I replaced the battery with the new battery and the cpu throttled with that battery again.

I tried repeatedly swapping out the two good batteries and reflashing the bios with the latest firmware version but that did not help. I tried to recreate the situation that left the cpu unthrottled. I though that if I downgraded the bios and then upgraded the bios with the battery I want to use installed the cpu would become unthrottled. 

I tried afuwin and afudos but could not downgrade. I have tried reading the ec firmware with RWEverything and linux, but no luck. The output file was all zeros.The idea was to read the firmware with the cpu throttled and unthrottled, figure out the difference and make a change to the nvram to force the cpu to be unthrottled. 

I have been using various AI's to help me figure things out. I have ordered a ch431 programmer to try and bypass the firmware protections. 

I am unsure as to the next steps to take. 
Is there anything I could have done differently to sort things out?

When I receive the programmer I can recreate the situation when the battery was installed and then the firmware updated. 
I also will be able to read the contents of the EC firmware chip, but I am unsure how this will help as I still will not be able to dump the current ec when the battery is installed and not installed. 

Any advice please. 
Thanks

[lucillegross2]

That’s a tough situation. Sounds like a weird firmware or EC conflict between the battery and BIOS. I’ve had similar throttling issues on Ryzen laptops. Updating firmware sometimes helps, but not always. Hopefully, the CH431 programmer gives you more control. This kind of hardware-level debugging takes patience!