PS3 RSOD on PS3 Fat

[espiritus]

I had PS3 4.92 Evilnat CFW installed. While in FSM mode, I accidentally tried to update to 4.82, and the console got bricked. The model is CECHA12. In FSM mode, I can navigate between menus, but whenever I click on any custom firmware option, the PS3 immediately freezes.
I tried almost every lv2diag.self file to exit FSM mode. I tested both the closest and farthest USB ports, but I couldn't recover the system in any way. I swapped the hard drive; the original disk was giving RSOD. Still, I couldn't solve it.
In FSM mode, the error I get is 80029C41, meaning the hard disk cannot be found. When I try to open a webpage in FSM mode, the console freezes again.
How can I fix this problem?

 

[iKon]

Yikes never update in FSM hahah you got orginal dump if so unsolder nor nand and flash back to chip and resolder to board...

 

[espiritus]

I have the dump. So ca i fix it if i wriete it back. But dump is only single bin file. Do you have guide to flash it to two nand chip?

 

[iKon]

Ah there is some info in here ya need to use FlowRebuilder to splt into 2 bins and flash it top bottom there is soem threads in the forms here about it oryoutube

 

[espiritus]

thx dude i hope i can revive my ps3 back with that dump