How to boot android phone without power button/volume control?

Hello. I was trying to repair digitizer on galaxy xcover2 s7710, but accidentaly managed to break off the flex cables to the power and volume control buttons. But it will take some time for replacement to arrive, so is here any way to turn it on? Tried adb, but it doesnt detect device, even after some tampering with drivers. When i connect phone to PC, device manager briefly shows it as "U8500 USB ROM", then disappears with the "disconnected" sound.

What should i do now to make it work? Thanks for any answers :)

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