Jailbreak Monte

Jailbreak Monte (j-ale-brek mon-t) is a jailbreak that was created by MuscleNerd to achieve an untethered jailbreak for iOS 4.2.1 on S5L8930-based devices. This is a so-called backup solution, because of stalled development for an "untethering" exploit for 4.2.1.

Technical Details
redsn0w sends data from the kernel of 4.2b3 via tcprelay.py (from usbmuxd). This kernel is the latest kernel that was still susceptible to the Packet Filter Kernel Exploit.

Requirements

 * redsn0w version 0.9.7 (beta 1-6)
 * An Intel-based Mac (A Windows version was not released yet because the process is "excruciatingly slow.")
 * iOS 4.2b3 (A paid-for Apple Developer account is required in order to download.)
 * SHSHs for your device and iOS 4.2b3

Status
Monte has been released as a beta program to a bigger audience. Each release fixed some problems. (see redsn0w). The current version still has the following issues:
 * Having a Windows version (see @redsn0w_testers twitter post). It will be very slow.
 * Porting Monte back to 4.1 (see @redsn0w_testers twitter post).
 * Data-restore with iTunes erases the jailbreak.
 * ? (DRM iBooks etc.?)