M21 E21 U5S MT6582 Firmware Flash File Download

Here's the solution that may possible fix and repair Nokia N78 Charger not supported
problem. This is caused by a damaged battery temperature resistor(BTEMP).
This resistor has a value of 47K, by replacing it might help fix the problem.

Nokia N78 Charger Not supported solution

N78 BTEMP Resistor location