I just want to test out tinyumbrella before I take the iphone4 back to apple store for an exchange, but after sucessfully upgrade to 4.1 with the preserve baseband 01.59.00 , I want to put it back to ios 4.1 with the correct baseband 2.10.04.
Dunno, maybe a bug in tinyumbrella.
i don't think semaphore (author of TU, aka @notcom) would consider this a bug
Anyway, if you're really set on upgrading baseband why don't you try downgrading to ios 4.0.1 and then doing a non-TU 4.1 restore? do you have shsh's for this?
Alternatively, you could say (at the apple store) "yeah i remember i got an error at some point, durrrrrr" and play dumb about the baseband version (if it even comes up). I doubt they could tell or prove you're lying (or care?).
Also, if you have 4.0.1 shsh's or 4.0.2 you could put it on that and and the old baseband would no longer be suspect...
And remember, the less info the better. You don't need to spill out the device's life story for the "geniuses"