I used the iPhone on the iPad baseband for ages, with no problems. After deciding I wanted GPS functionality, I downgraded the baseband using the latest version of redsn0w. Now it isn't turning on, it just stays at an Apple logo for about 10 minutes, black screen, then repeats.

I was tethered on 5.0.1 but installed corona 5.0.1 untether. Should I boot tethered in redsn0w?

Thank you in advance.

(By the way, this IS an older model of the 3GS.)