HP 250 G7 : Can I flash microcode only?

[castillofr]

Change to 00.
Reboot (Win10).
Reboot (RU) -> 01 again

[DeathBringer]

Try to find the way to change them.

[castillofr]

OK! Many Thanks DeathBringer

[DeathBringer]

BTW: PchSetup has RT flag, so it can be edited in any OS with EFI boot (non legacy).
E.g. you can try to use UEFIVAR by Zibri
1. Dump PchSetup:
uefivar -G:"4570B7F1-ADE8-4943-8DC3-406472842384" -N:"PchSetup" -bd:"PchSetup.bin"
2. Edit PchSetup.bin in any hex-editor.
3. Import PchSetup:
uefivar -G:"4570B7F1-ADE8-4943-8DC3-406472842384" -N:"PchSetup" -I:"PchSetup.bin"

[castillofr]

   
Unfortunately, it didn't work!

[DeathBringer]

Run:
uefivar -l > list.txt
and show list.txt

[castillofr]

Run:
uefivar  -l > list.txt
and show list.txt

[DeathBringer]

Try to run:
uefivar -l -bd
and find a file with PchSetup in name.

[castillofr]

@DeathBringer
I read that:
[Intel microcode update can be used, in a BIOS mod, but not flashed directly!]

I must dump the BIOS region first, update the microcodes (how?) then flash back the updated BIOS region with FPT...

Can you confirm this?
Thanks!

[DeathBringer]

You can't flash BIOS by FPT without disabling write-protection.