Jailbreak iOS 6 beta 1 with Redsn0w 0.9.13dev1 on iPhone, iPod Touch (A4 Devices)

downloads page. This version works the same as the previous versions. Note that this is a tethered jailbreak, and only works on devices older than the iPad 2. Musclenerd has also advised that this jailbreak only be used by developers of jailbreak apps.

Supported devices:

• iPod touch 4G
• iPhone3GS
• iPhone4 (GSM)
• iPhone4 (CDMA)

THIS JAILBREAK WILL NOT INSTALL CYDIA! MANY APPS WILL NOT WORK! USE THIS JAILBREAK AT YOUR OWN RISK!
If you are unsure of whether to use this jailbreak you should probably stay away for now. All information about this jailbreak is available on the Dev Team’s blog post. You will only be able to access your device through SSH or afc2. This jailbreak is intended only for people who know what they are doing, and are registered Apple developers. If you wish to continue, just follow the directions below.
1. Open Redsn0w and select “Extras”
2. Click “Select IPSW”
3. Browse for and find the iOS 6 beta IPSW
4. Go back to the first screen and click “Jailbreak”
5. Follow the onscreen instructions and wait for your device to complete the jailbreak
6. Go back to the “Extras” screen and select “Just Boot”
7. Follow the onscreen instructions again and wait for your device to reboot
Source