New battery, new charge port, still wont charge..

Slight water damage.
Put device in pure alcohol, then rice.

Replaced battery… unit powered up and seems to have all functionality.
Except battery charge.

Replaced Battery Charge module. Now it sees charge power, but says
"Device Not Recognised" and refuses to accept charge.

1 . Is it the motherboard damage?

2 . Is it a non apple charge port that is not recognised?

3. Is it the iOS. Currently version 7… needs to be version 9

4. something else?