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Can you post picture of the BMS with all the ports?

Turn on location on your phone and apply charge.

If your wiring is correct connect the balance cable do not connect the -P and -B, check the voltage if not the same on -P and -B apply charge 14.4v and min 2A as somebody posted .Negative -P, positive to positive of the main battery terminal. This should do the trick, if the BMS is not damage...