Hello, First time poster here so I apologize in advance if this issue has come up before and been answered. I seem to get different answers when I search the web and I am lost so I thought I would just ask here. I am a n00b at this kind of stuff so if i did something stupid, have mercy I have an iPhone 3GS that is running iOS 5.0 tethered jailbreak via redsn0w. The phone has a baseband of 6.15.00, serial # xx022xxxxxx, model 'MC' (I believe this means new bootrom). And looking in TinyUmbrella I have no saved SHSH blobs. <-- not sure if that matters just trying to give as much info as possible The phone was originally running 4.1 and I used redsn0w last night to update to 5.0 while preserving the baseband at 6.15.00. The update and jailbreak completed perfectly while preserving the baseband. I was able to use redsn0w to boot the tethered device. However, this morning when I tried to boot the device using redsn0w I got a blank white screen. The phone will not go anywhere past this white screen of death. Side note: I am able to get the 3GS into DFU mode (if that helps at all). Ok so besides fixing the white screen of death, my ultimate goal is to get this phone onto some kind of an untethered jailbreak and unlocked via ultrasn0w to be used with any sim. From what I read, I need to either preserve or downgrade the baseband in order to do this. I have read articles suggesting the program sn0wbreeze, and others saying just use redsn0w. Articles have mentioned I need to downgrade the baseband otherwise certain features won't work (GPS, etc). As sad as this sounds I can't seem to even find out what versions of iOS are available in untethered for the 3GS while keeping or downgrading the baseband. Please help!! I appreciate you guys (and gals) taking the time to help with my problem. Thanks in advance!