Make sure your dump is valid: http://www.ps3devwiki.com/wiki/Validating_flash_dumps
Then follow this: http://www.ps3devwiki.com/wiki/E3#Fl...for_Debricking
I always make a dump and validate it. Then make more dumps, to make sure the clip is still secure. And compare the dumps with HxD, analysis tab, file compare. They need to be identical.
If you started flashing and the clip wasn't secure, the ps3 bricked. So hopefully the dump you did get is valid.