Up date still problems with micra

hi fitted full Ecuador kit, the car is completely dead , now even the new key does not turn on, the new thing I got is an alarm coming from new ECU ,but when I keep my foot on brake pedal it becomes quite, can't figure out what is it, the other thing when I swop back old kit just leaving the new ECU with old kit the fan runs matts light goes off but engine does not turn , the car locks and opens from old keys I wonder what is happening any input please?

Thanks
 
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