I installed some early beta software on my iPhone a few days ago, and apparently something went terribly wrong because I couldn’t use Installer.app after that. No problem, I’ll just restore to 1.1.4 and use ZiPhone to jailbreak it, right? Wrong.
After restoring the phone to 1.1.4 I ran ZiPhone, things went normally until it reached the “Installing base apps…” screen, where it decided to lockup. I killed the ZiPhone process and restarted the iPhone, it booted right back to the ZiPhone install screen again, and again, and again.
Next I tried booting into DFU mode. If you’re unfamiliar with DFU mode, you enter it by pressing and holding the home and the power button simultaneously, once the phone turns off, continue to hold the home button while turning the phone back on. It’s important that your iPhone is connected to your computer with iTunes running for this to work.
DFU mode led to moderate success, iTunes recognized it and allowed me to restore the firmware to 1.1.4. However when it restarted it now only displays a black screen with one white block in the upper left-hand corner.
My plan right now is to try restoring it to an older firmware and seeing if that yields any result.