I finally took the plunge and upgraded to 5.0.1 on my iphone 4 while preserving my bb (01.59.00) using Redsnow 0.9.10b5c. It's working wonderfully. Now it's time to jailbreak! After running Redsnow and selecting Jailbreak, then entering pwned DFU mode, I get the dreaded 'no identifying data fetched' error. According to Google, one solution is to manually select the IPSW first then re-run the Jailbreak process. When I went to select my IPSW, I selected the one prefixed with NO_BB_xxx because I do not want to risk losing my bb. When I do this, however, Redsnow says the firmware isn't supported. Do I have to select the stock 5.0.1 IPSW for my phone to do this and if I do, will I lose my 01.59.00 bb?