Originally Posted by SonyH@K&R
I installed this fw without any problems. I was on 3.55.2, installed 3.55 OFW from recovery and finally updated from OFW 3.55 to 4.21 rogero from XMB. No brick, no RSOD, data is still there. Updating multiman to last version because old version (4.06) black screens because of payload.
Other than that, perfect 
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ur ps3 model number is..cech???