I wasn't aware they released a new version of 5.0.1 with a BB update. Thanks!
-just did some research on 9A406, and that was the fix for "no-sim" I haven't found anything about it updating BB yet, but will update again when I find out.
-Ok, seems like 9A406 is only for iPhone 4S users, it won't affect those on older devices.
well yes, you have to download stock 5.0.1 for your device, then update iTunes, and download the latest redsn0w.
Open redsn0w click extras, make custom firmware. It will make a firmware that should start with "NO_BB_iPhone"
Then you will want to put your phone in DFU, close redsn0w and open iTunes.
Option click "restore" and make sure you select the correct ipsw... starts with "NO_BB_iPhone" and it will update while preserving BB
**forgot to say... pretty sure redsn0w can only make custom ipsw on macs at the moment. That feature should be coming to the windows version soon.