Hi there, I have a 3GS on BB 06.15.00, version 4.1. I did a jailbreak on this phone about 8 months ago, which all went well, but once the jailbreak was complete it would not find a signal on any sim (No Service) despite using Ultrasn0w (and following full instructions). The IMEI has been checked (it's a 2nd hand phone) and everything else works perfectly.
Because I couldn't use the device it was left in a drawer, and I came across it yesterday. I would really like to get this device working on any network so some use can be made of it. Can anyone guide me as to which version of Redsn0w (or alternative) that I should be using, with regards to the information provided.

According to TinyUmbrella the SHSH blobs stored are: 4.1 (8B117), 5.0.1 (9A405), 5.1b2 (9B127c) and 5.1b3 (9B5141a)

Thank you so much in advance to anyone who can help, and I hope it's not too dumb a question!

If you're already on BB 06.15.00, then you may as well upgrade to iOS 5.0.1 directly through iTunes in Pwned DFU mode after creating a no_BB firmware with redsn0w 0.9.10b5, then use redsn0w to re-install the iPad baseband, then use redsn0w to jailbreak (don't do both at the same time, it'll crash). Afterwards, install ultrasn0w 1.2.5 from Cydia and see what happens. If it still doesn't work, let us know and we'll start troubleshooting. No sense in troubleshooting old tools when a more recent untethered jailbreak exists and you're already on 06.15.00.