I followed the tutorial, but had to use Rogero 3.55 DEX v3.47 because some of the pkg wouldn't work (the ones to dump my DEX flash, 'cause yeah, I lost my original CEX dump).
So, the thing is, I was on 3.55 DEX, I still had my EID0 key from when I originally went from 3.55 CEX to 4.21 DEX and I needed to build a CEX flash. So, I tried to do so using Memdump. When I would try using c2d with Nand support (my PS3 is a fat version, with NAND), it would tell me that the input flash file was incorrect. I tried to dump the DEX flash again using Multiman, but I never managed to get it to work (error: ISO file cannot be created). In the end, I found a pkg that worked: dump_flash.pkg. It was really really slow to dump (like 45 minutes I think), but in the end, I got my flash dump, and that one would work with c2d.
So, following the tutorial, I used Multiman CEX version to write the CEX flash file to the PS3. Mm seemed to think it worked fine. Then I exited Mm, and ran reboot.pkg. The PS3 shutdown and emitted some weird beep sounds. Not the usual ones.
Now it won't start again (I mean, the light goes green, I get the weird beeps, then it stops and the light goes red).
I realized after that, that on the USB key that was plugged in when I ran reboot.pkg, was a Lv2diag.self file that was designed to get out of RSOD (I had a RSOD when I tried to install the Rogero fw from factory service mode). I forgot to delete it after getting out of Factory mode... Could it be the root of the problem?
Anyhow, I put up a video on YouTube to show you what the weird beeps sound like:
If anyone could help me... Thanks!