3.55 Brick

I sucessfully downgraded my ps3 from 3.7 to 3.55 (KMEAW No Check) using progskeet and ti-84plus.

But then I wanted to install rebug CFW so I tried to install OFW 3.55, but my PS3 bricked.

Already tried going service mode and recovery mode without sucess :(

What can I do to unbrick it?

Many Thanks