Automatic SSH ramdisk creation and loading

A runnable JAR archive - works on OS X or Windows; needs 32-bit JRE on Windows.
Supported devices - hopefully everything Syringe supports (devices with A4 chips and lower) plus iPhone 2G, iPhone 3G and iPod Touch 1G.
The tool automatically downloads required files from Apple using @planetbeing's Partial Zip, patches them and sends to the device.
If everything works as it should, the only thing you need is an SSH client.
Credits:

Made possible thanks to Camilo Rodrigues (@Allpluscomputer)

Including xpwn source code by the iPhone Dev Team and @planetbeing
Including syringe source code by Chronic-Dev and @posixninja
syringe exploits by @pod2g, geohot & @posixninja
pwnage2 exploit by iPhone Dev Team
Special thanks to @iH8sn0w
code.google.com/p/iphone-dataprotection - EMF tools and kernel patches

To see more verbose stuff, run from command line: java -jar ssh_rd_rev04b.jar
Source on github.

Booting 4.2 bundle - instructions

Instructions

• Download the appropriate tetheredboot binary for Windows or OS X from https://github.com/msftguy/syringe/downloads
• Update: OS X version does NOT need libUSB from MacPorts any more.
• Put the device in DFU mode
• Use the command line tetheredboot -i iBSS.CPUap.RELEASE.dfu -k kernelcache.release.CPU to boot, where CPU is k48 for iPad, n90 for iPhone4
• These files (iBSS and kernelcache) need to be extracted from custom ipsw you made using the bundle!

Bundles 

• Look here for bundles: https://sites.google.com/site/msftguy/file/

Data recovery: not just for iBoot-pwned devices

Deprecated: Now you can use greenpois0n to load an SSH ramdisk on any new device.

Update: wrote a tool to generate upgrade IPSWs automatically
iPad data recovery!

If your user data partition is not corrupted, it's possible to get your data back (say, after some Cydia app made your oversized iTouch hang on boot!)

Should also work for iOS 4.0 new bootrom 3GS iPhones and 3G iTouches.


Will it work if you were jailbroken with:
PwnageTool: Not recommended/might work

SnowBreeze: Not recommended/might work

Spirit: YES

redsn0w: YES

blackra1n: YES

Not jailbroken: YES


Other necessary conditions:

Mountable user data volume - not always the case!

Other warnings:
You'll obviously lose your jailbroken state and will have to re-Spirit if using iPad or just back up and restore if using a PwnageTool/SnowBreeze iOS4 jailbreak!

When should you use this method?

• You have an iDevice that does not boot (stuck in DFU/on Apple logo) with important data on it (kids pix, financial reports, names of Russian spies)
• You are not jailbroken with PwnageTool/redsn0w/blackra1n/Sn0wbreeze
• If you are jailbroken using one of those jailbreak methods, check out SSH ramdisk method first as it guarantees non-destructive recovery.
• You don't need the device to remain jailbroken/unlocked or can jailbreak/unlock a device that has been restored to latest firmware version.

Download:
Windows version, Python source

Usage:
Use current firmware version that is still being signed by Apple (4.1 ATM)!
Drag and drop original unmodified IPSW file over the tool icon, wait for it to generate a UPG_...ipsw file, restore to that using iTunes.
Make sure you've read the necessary conditions and warnings sections!

Look at the source code if you want an insight into what exactly happens here.