Ok, I'm very confused here.
Give you guys and overview of what I have done, probably you guys can tell me what can I do next.
I initially installed 4.10 TechnoDon's MFW, but I accidentally upgraded to 4.11 Demo firmware, after which i used the e3 flasher to backup the bios, and downgraded successfully to 3.55 Rogero v2, I made another backup of it too.
I tried to go back to 3.55 OFW via recovery mode from Rogero v2, but ended up a YLOD brick.
Since the ps3 wouldn't stay on, I soldered a GND point on the PS3 to the NOR Tristate Point and managed to flash my bios following the e3 unbricking manual, completed and got the dancing lights.
Here's my current problem, the screen remains black. I tried formatting the HDD. I tried doing the one with the patched backup and e3_downgrade.bin. Both to no avail. It is good to know that I tried to enter recovery mode, but when I pressed and hold the ps3 power button (mine's a cechk06 fat), it switches off instead of producing the beeps.
Any ideas on how to go on? =(
EDIT: All my backups are verified with flowrebuilders, so I doubt it's the backup issue =(