stuck in DFU cannot restore 3Gs
hi, I'm playing with an iPhone 3Gs new bootroom factory unlocked that got stuck in DFU mode after "restoring to a custom 4.1" (as I've been told) and we have no infos about saved SHSH.
I made an attempt with DFU pwned, Tinyumbrella and a 4.1 custom (not really sure it might have been the right thing to do though) but after the white screen all I get is an iTunes "error 28".
Is it definitely an hardware failure or could also be, let's say, the battery too low?
I might try to restore to a stock 4.2.1 and see if it fixes the boot but if we don't have a SHSH we won't be able to go back to 4.1 and do a proper jb...... is there any possibility to check for saved SHSH when you're stuck to DFU?