Iriver H340 Akku + - reversed.

[Apophys]

Hello,

I have replaced the battery of my H340. Here it was swapped in the new battery positive and negative thing I have noticed in retrospect.

Now the H340 will not boot and also with power plug goes nothing.
Only if I have no battery in the H340 can start with the plug of the player, but only in the original firmware.

So it is not broken, the whole player. What can I do now to get him back to run to bring?