Notebook Boot and Lockup

Hello everyone,

Intro

My wife has this laptop (HP Pavilion 15 - cw1501nd) now for +/- three months, she told me that it takes a long time to shut down and that sometimes the battery drains while shutdown. So I check for software updates in the HP support assist tool and there was a new BIOS, as that might be a fix, I selected the BIOS update and executed it.
(The BIOS name is: F.45 Rev.A, 17 jul. 2020)

The problem
After executing the update the I was surprised by a boot loop that sowed the following screen:
verification of flashed bios image failed

After a reboot, it tries to reflash the BIOS and returns to the exact same screen. So it is stuck in a failed BIOS recovery loop. Essentially it is bricked.

Things I tried

• 1) Starting with Windows + V, to clear the CMOS
• 2) Starting with Windows + B, to trigger a recovery
• 3) Holding the power button for 15 seconds to reset the system
• 4) Starting with Windows + B and a BIOS recovery USB stick with BIOS F.45 Rev.A (the one that I tried upgrading to)
• 5) Starting with Windows + B and a BIOS recovery USB stick with BIOS F.35 Rev.A (a downgrade)
• 6) Starting with Windows + B and a BIOS recovery USB stick with BIOS F.34 Rev.A (a downgrade)
• 7) Starting with Windows + B and a BIOS recovery USB stick with BIOS F.33 Rev.A (a downgrade)

(I did steps 1, 2, and 3 multiple times between steps 4, 5, 6, and 7)

Results

• Steps 1, 2, and 3 were no success. (also not in between steps 4, 5, 6, and 7)
• Step 4 gives flashes the BIOS from the USB (I can see the USB being used because of the flashing light), but ends exactly the same a the original BIOS update, in a BIOS update recovery loop.
• Steps 5, 6, and 7 ends in the following screen, it looks like a BIOS downgrade is not allowed:

Unable to open BIOS signature file

Possible solution?
Might a new BIOS that validates solve this issue? Can I ask HP for a beta BIOS or something?

Thanks for your help!