Dell XPS12 messed up during 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

thanks for your response.
*) I can connect the charger to the laptop, and the laptop charger stays ON. I can't say nothing about the system leds, because I can't turn on the laptop due to the corrupted BIOS.
*) Again, I can't power it on so I don't hear any beep.
*) Same as above, I can't toggle anything because I can't power it on. The only thing I can do is the procedure to Re-install the bios. I insert a USB stick with some BIOS files, then I keep pressed "end" button and then I insert the charging cable. In this mode the laptop powers on with the power led blinking fast, but nothing happens then. I think I'm using the wrong files to re-flash the BIOS, can you provide me the right How-to? probably it can be the problem, because the laptop was messed up during a freeze in the BIOS update in Windows, as i wrote in the first post.
thanks,
Fabio

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