Beta OTA Updates/iPod touch/5.1

From The Apple Wiki

iPod touch (3rd generation)

Version Build Prerequisite Version Prerequisite Build Release Date OTA Download URL File Size
5.1 beta 3 9B5141a 5.1 beta 2 9B5127c 9 January 2012 6997c9f76060dde8071a3c02d07359dd2d702009.zip 63,554,861

iPod touch (4th generation)

Version Build Prerequisite Version Prerequisite Build Release Date OTA Download URL File Size
5.1 beta 3 9B5141a 5.1 beta 2 9B5127c 9 January 2012 e718832f57845f146010545386f1949a1353999b.zip 66,859,676