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Dell XPS12 Messed up during A08 BIOS update

Hi all, yesterday I tried to update my Dell XPS12 (9Q33 mid 2013) BIOS to the last version (A08). During the installation, the laptop remained stuck in "EC programming" at 50%..I waited two hours but nothing changed and my PC was unusable: completely blocked, no keyboard,no touch and even the windows clock was blocked. 

So, as I read in a lot of BIOS-related threads, I removed the AC adaptor and let it discharge completely..some users resolved with this workaround, and their PC's worked well after.

Unfortunately, my XPS12 doesn't want to power up anymore..I also tried to put the .hdr file of the BIOS in a USB stick and tried to power up with "end" button pressed. It powers up and the fans are working, but nothing happens then..Am I using the wrong procedure to repair the BIOS?

Thanks in advance,

Fabio

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