So my iphone 4 was stuck on apple logo after the battery died out and I tried to recharge it. After recharged it remained on the apple logo., not good.

I've Tried:
-hard reset, don't work
-recovery mode escape, don't work
-charging in outlet, laptop, car - don't work

Worst come to worst, the only solution.

The solution: restore and lose all your data.
Restore to 4.3.3 while you can.
I was lucky. Apple didn't stop singing.
Restore, custom FW, preserved baseband,

iphone 4 is still unlocked !
Wiped clean and is fast like a new phone.