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Spectre x360 13-aw0xxx Bios Update F.26 and Thunderbolt charging problems

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Spectre x360 13-aw0xxx (13-aw0013nl)
Microsoft Windows 10 (64-bit)

Hi, I've a Spectre x360 13-aw0xxx (13-aw0013nl) that today upgrade the bios to F.26 via Windows Update.

The upgrade got stuck in the flashing process and after 2 hours I decided to force the reboot. The computer booted and in the System information seems having flashed correctly all.

However, the notebook can't charge via my Monitor (LG 34WK95U-W) via it's thunderbolt cable that is used for the video signal too (the cable charge another notebook). The Spectre x360 still charge via standalone charging cable.

I tried to rollback the bios via the integrated bios rollback function but it tells me that the previous version is corrupted.
I tried to flash the F.15 that there is on HP website, but doesn't allow me to rollback. Curiously the F.26 can't be found on HP website. Maybe they know there is a bug on it? Anyway, as result now I can't use my external screen to work all day long 😞

Can someone suggest me how to rollback to F.15?

Thanks,
Mauro

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