iH8sn0w, the developer of Sn0wbreeze has made available Sn0wbreeze 2.8b8 with which you can jailbreak iOS 5 GM build on Windows. It is same as that of Redsn0w 0.9.9 except the fact that it preserves the baseband. Redsn0w 0.9.9 supports both Windows and Mac whereas Sn0wbreeze supports only Windows.

Sn0wbreeze 2.8b8

Except for the iPhone 3GS (old bootrom), all others except iPad 2 can have a tethered jailbreak on iOS 5 GM. You’ll have to use iBooty on each reboot to get back the jailbreak. Here is the full release note of Sn0wbreeze 2.8b8 :

sn0wbreeze v2.8b8 [GM] – Release Notes
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* INSTANT IPSW detection (seriously!).
* Now jailbreaks iOS 5 Gold Master (9A334).
* UDID Developer check removal is no longer needed.
* Still has the ability to hacktivate.
* Still preserves the baseband (as always!).
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           Tethered Boot?
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* iPhone 3GS (old bootrom).........NO
* iPhone 3GS (new bootrom)........YES
* iPhone 4 (GSM)..................YES
* iPhone 4 (CDMA).................YES
* iPod Touch 3G...................YES
* iPod Touch 4....................YES
* iPad 1G.........................YES
-------------------------------------
** REMEMBER TO BOOT WITH "iBooty" **

Download Sn0wbreeze 2.8b8 from here

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