Last weekend, iPhone Dev-Team released Ultrasn0w 1.2 to unlock iOS 4.1/4.2.1 on iPhone 3GS/3G. After unlocking baseband 06.15.00 with Ultrasn0w, many users reported drastic drop in iPhone battery level and iPhone overheating issues. Sherif Hashim, a known iPhone baseband hacker, has shared his thoughts on the mentioned problems and suggested some possible resolutions. Details after the break.
Sherif explains that these problems are not actually inherited from Ultrasn0w but it's the hactivation process which is causing these problems. Hactivation is a process allows you to activate your iPhone without using an official carrier SIM via jailbreak tools like Pwnagetool or Redns0w.
Main problem lies with iOS 4.1 and iOS 4.2.1 IPSWs, unlike old the firmwares, they keep searching for valid push certificates all the times via your Wi-Fi or cellular data network (3G/EDGE/GPRS) which will eventually lead to battery drainage and overheating issues.
Following are few resolutions shared by Sherif to these problems:
- Try to activate your phone with an official carrier SIM like AT&T etc. If you don't have the official SIM, you can borrow it from your friend for a while. It will bar the search for valid certs in iOS 4.1/4.1.2.
- If you can't get hold of an official carrier SIM, turn your cellular data and Wi-Fi services off while you are not using them. To quickly toggle these services, you may use SBSettings available in Cydia. [via S.H]