Are you aware of these steps on downgrading and unlocking baseband? No! here’s good news for all iPhone 4 users who are stucked on higher basebands with neither can be unlocked by Gevey SIM nor Ultrasn0w. Sherif Hashim is one of the well known iPhone baseband unlocker, the guy behind Ultrasn0w has confirmed that he is still working very hard to unlock iPhone 4 04.11.08 baseband on iOS 5/5.0.1 and 02.10.04 iPhone 4 baseband on iOS 4.1.
The iPhone unlocker said in briefly about iPhone 4 GSM unlock:
“YES i am still working on the VERY TIGHT bbfw 2.10-4.11”
And said to simply wait instead asking him about the release date.
“NO NEED to ask because it won’t make it achievable/earlier/easier.”
We are here to know that the status of the work will be communicated by either him or the iPhone Dev Team, MuscleNerd when the ultrasn0w unlock is available.
Reminding again: The ultrasn0w can only unlock iPhone 4 baseband to 1.59.00. Higher basebands can be unlocked with Gevey SIM limited upto 04.10.01. Here comes the actual problem, when you are trying to unlock iPhone 4 on 04.11.08 baseband. Sherif Hashim is working hard on the 4.11.08 and 2.10.04 baseband unlock using ultrasnow.
If you have upgraded your iPhone 4 to iOS 5.0 or 5.0.1, you will be not able to unlock that latest basebands, to avoid failing in those basebands and who rely on unlock using ultrasn0w or Gevey SIM must stay away from the iOS 5.x.x firmware.
Useful tip: In case you want to upgrade to iOS 5.0.1 without upgrading your iPhone 4 baseband to 04.11.08, you’ll need to preserver your iPhone baseband. I mean you have to update your iPhone 4 via custom firmware to preserve the older basebands using the guide posted here, which will allow you to preserve basebands while updating to iOS 5.0.1 using Redsn0w or with PwnageTool.