Vstarcam H6837WIP

Dear Sir,  I have an electronics company and purchased a ip camera for evaluation.  The camera has only been used for around one month. After a multiple power cut it failed. The camera still switches on but it has lost all other function. I cannot connect to it by lan to update the firmware. I have tried pressing the reset for short and long periods but still cannot make progress. I believe that there may be a technique of reinstalling the webUI from a TF card . If this is so I will need the webUI firmware download and the method of installing it. If nothing can be done may I return the circuit board to you for repair or replacement. It would be too costly for both of us to return the full camera. As I am an electronics engineer I would have no difficulty in replacing the board.
Thank you .