Cant't Downgrade LAPBC710 firmware version from 0077 to 0071

[lucasboulle]

Hi

I'm trying to downgrade the firmware, because after upgrade from 0071 to 0077 my ABNT2 keyboard stop to working properly, the "?"  key are interpreted as "CTRL" key and the backlight stopped working. So I'm trying to downgrade firmware version by  recovery cap file booted with usb file, using F7 boot update option.

Boot when the update is starting, my laptop just restart normally and does not update, I'm posting a video below with this behavior.

Can I be doing something wrong?

[AlHill · Accepted solution]

The reason you cannot downgrade is in the bios 0077 release notes:

https://downloadmirror.intel.com/751339/BC_0077_ReleaseNotes.pdf

Specifically, it says:

Known Errata:
• Due to a BC0072 module upgrade, User cannot flash/recover
downgrade to BIOS BC0071 or earlier.

Doc (not an Intel employee or contractor)
[Maybe Windows 12 will be better]