dual-boot your iPhone!
Source: snapvoip.blogspot.com
Brought to you by NerveGas, planetbeing, ghost_000, dinopio, bgm, MuscleNerdand the combined iPhone-Elite and iPhone/iTouch Dev teams. OVERVIEW (by NerveGas) The dev team has been using dual-booting to jailbreak the iPhone for severalmonths now, however now that several more advanced techniques have beendeveloped (many of which are still private), I thought it apropos to releasethis cool hack for those who would like to dual boot multiple versions ofthe iPhone software (or other OS’s) from their handset. It’s a neat littlehack that I think might be useful for developers playing with 1.2. I’ll walk you through a sample jailbreak scenario with 1.1.4, using 1.1.1, toshow you what I mean. To do this, you will carve out a new partition on theiPhone and install version 1.1.1 on it. You’ll then upgrade the iPhone tov1.1.4, which will leave the new partition intact. You can then dual-bootthe iPhone, allowing you to mount 1.1.4’s partition using the 1.1.1 partition.Once mounted, you’ll make some changes to the mount points and install OpenSSH. Once you’ve got two versions of the OS functional, you can easily switchbetween them by changing your root-device. For example: nvram boot-args="rd=disk0s3 -v"
