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restore software version for strong 4350

Hi to all .
last year i made a software upgrade to my digital receiver strong 4350. it was all OK, but 2 weeks ago my receiver stoped working properly. it can't load the software when i turn on the satelite receiver.I just receive an error code
"bt2.0".Curent version of software is 2.04.28.
Can someone tell me how can i restore the previous version of my software?
Or it has problems with the hardware (memory chip maybe)?
Excuse me for my terrible english.