Fix 1604, 1603, 1602, 1601, 1600 Error While Restoring Custom iOS 5.0.1 IPSW Firmware File Using iRE

i have 3gs old bootrom 4.3.3 6.15.00 JB via redsnow & interested to get onto 5.1. please note i have shsh backed up for 4.1 & 4.3.3 dumped through tiny umbrella. question is, if i make a custom ipsw of 5.1 using snowbreeze then can i restore it hoping app

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