Flight controller Bootloader (or driver?) issue

I hope someone can help. I'm currently putting together my first quad build and im having and I'm having a betaflight / driver issue (I think?!).

I'm using a kakute v2 aio board and in my haste to get the build together I didn't pre-test the board, I soldered the build together, I downloaded the drivers (impulseRC driver checker) and plugged it into betaflight.

When holding the 'boot' button it would connect to my laptop device betaflight would go into dfu mode but as soon as I let go of the boot button the computer would eject the quad?! When keeping the button pressed I can even get as far as flashing the firmware, but again, as soon as I let go it's disconnected.

Can anyone suggest a way forward? Thanks. 

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