Black screen after BIOS update

[LFR1]

Hello I have a hp 240 G7 7DE52ES#ABF.

I updated the BIOS from hp drivers site.

Problem :after bios update the screen is black ( the power light is on).

I tried the update version before (there were 3 updates availables) with the usb key and windows + B trick, The screen lighted the time t update bios.But no more success after restart. Always black.

I tried the windows+B trick to recover the last BIOS working. Always black.

I don(t know whre it comes from but i am annoyed.

I'd like to get back the verison of the  BIOS i originnaly had, it seems it was anterior to the BIoses proposed on hpsite.

How an i do ? cheers from France

Edit on another same model, the BIOS version which is installed is the F.56 but i can't find it anywhere.

[ub6424]

Hello @LFR1 

Sorry to hear that you are having problems ... I would like to help you.

(1) Power off computer

(2) Disconnect charger

(3) Press and hold <power> button for 30 seconds

(4) Connect charger

(5) Follow the HP standard procedure

 https://www.youtube.com/watch?v=qpiGUojtr3E

(6) Please report your results