Folks at pushfix repo has released an unofficial ultrasn0w fixer which can unlock iphone 4 01.59.00 baseband on ios 4.3.1. for those who don't know, ultrasn0w 1.2 was broken on ios 4.3.x due to apple aslr security feature which broke ultrasn0w code naively using 0x1000 as the main executable base address.. Restoring ios 4.1 on iphone 4 also updates its baseband 01.59.00 to 2.10.4 which is not unlockable at the moment. so, ios 4.1 is an alarming update for all those depending on unlock. pwnagetool by dev-team has the ability to preserve iphone baseband but unfortunately it’s not yet updated with ios 4.1 support.. Ipsw downloader - download official ios firmware (ipsw) files for iphone 6 plus, iphone 6, iphone 5s, iphone 5c, iphone 5, iphone 4s, iphone 4, gsm, cdma, iphone 3gs, 3g, 2g - ios 8..
Installing ultrasn0w will unlock iphone 4 ios 4.0.1, 4.0 with baseband 01.59.00. once the installation is completed, reboot your iphone 4. voila! you have unlocked iphone 4 baseband 01.59.00 with ultrasn0w 1.0-1 and can use sim from any carrier now.. Upgrading your iphone 4 to ios 4.1 will update its baseband from 01.59.00 to 2.10.4 and baseband 2.10.4 is not unlockable at the moment. pwnagetool is an option to preserve iphone baseband but at the moment it doesn’t support ios 4.1.. The iclarified unlock wizard helps you determine the correct tutorial for unlocking your iphone..
