Hi All, I am using an iPhone 4 with iOS 5.0.1, jailbroken (untethered) and unlocked (ultrasn0w, baseband 01.59). The problem for me started 2 days back when my iPhone suddenly lost reception/network. It used to behave similarly in the past, but I used to switch the phone off and switch it back on after a few mins and plug in the SIM and all was well again. But this time, the network didn't come up till the next morning. So started googling and found nothing substantially helpful about it. I tried reinstalling ultrasn0w and soft resetting the iPhone (with power + home button) with no luck. I got a little frustrated and started uninstalling packages from Cydia. I uninstalled Corona untether 5.0.1, post which I manually restarted my iPhone and since then it boots up to my lock screen and then restarts within 5 seconds, stuck in a loop. Also my phone started displaying "Searching.." in place of network bars. PLEASE NOTE - I already had an UNTETHERED jailbreak so I wasn't dependent on Corona for that, I had installed some package (which I fail to recall) which installed Corona as a part. So I knew I had no way out but to completely reinstall iOS 5.0.1. And I forgot that Apple has stopped singing previous versions of iOS. So yet another problem for me! I tried creating a Custom IPSW with Pwnage Tool and tried to restore, ended up with error 11 (with TinyUmbrella running in the background and TSS server ON). I have googled a bit and found that using iFaith I can get what I want, which is to reinstall iOS 5.0.1 and jailbreak it untethered while preserving my baseband for an unlock using ultrasn0w. I found this article on jailbreakqa, which I think will help my do it on my Mac: http://www.jailbreakqa.com/questions/32462/frequently-asked-questions#94647 I was just wondering will this update my baseband if I go through with it ? Do I have any other options ? Please help and pardon my lack of technical know-how Thanks! Also TriJetHero posted the following, in which he clearly stated that the baseband will be upgraded. In TU advanced tab uncheck set host to cydia, close TU For the rest you don't need TU to restore. In redsn0w go to Extra's/SHSH blobs/Stitch select the stock 5.01 IPSW (download), make sure your phone is unlocked, this will upgrade your BB to 4.11.08 which is unlockable redsn0w wil now make a custom IPSW with your SHSH/APticket stitched to it Put phone in DFU ALT-restore with the custom IPSW afterwards jailbreak with redsn0w You don't need to restore to get it activated, you can use SAM (repo.bingner.com) to deactivate your phone, when you connect to iTunes it should activated with the congrats message.