Bricked PS3 slim when going back to CEX

First of all I would like to thank you all for such a great webpage PS3Hax.net.
I've been here looking for news almost daily since I first got my slim with 3.40fw two years ago.

Now for the first time, I have some serious issues with my PS3. When I saw the the CEXtoDEX news I quicly had to try it. I already had linux on my console so dumping the root keys from metldr were not such a big problem.

I converted my console do DEX and were happy with that for a week. Going up and down from 4.11 to 3.55, making 3.55 with peak and poke etc. I then got to brave, and wanted to be able to easy go back and fourth from DEX to CEX.
Only reason I missed my CEX console is that I have Cobra key, so I'm then able to load bluray Iso's and game Iso's over my Gigabit LAN.

I found a guide on a Italian site showing how to "Easy convert DEX back to CEX" . This is how I bricked my console.

Now when I try to turn it on it beeps once like normal, but then after a secound it shuts down, and no light on the led. Not even red light.

So my question is this. I have a valid dump of the NOR that I made when converting to DEX, is it then easy to unbrick my console with a hardware flasher like e3 flasher?
I know I will probarly have to soldier some in order to keep the power on the console for the flashing.

If anyone can answer me this i will be very happy. If it's possible I will order E3 flasher today'

Regards