Tenka ESC using an old bt module from a focbox

[jaykup]

Looks like the SWD port is a black port just above the white JST connectors.

This link that glyphiks posted above should show where to plug it in, as the Unity and Tenka are basically the same thing.

Unity not booting? You are not alone! (How to fix the bootloader)

Hello! I had the pleasure of dealing with a broken bootloader for my unity. Since I got quite a few requests for this and it was not a pleasant issue to fix with non-responsive support I decided to make a guide for it. Always try to go the route of support with this first! After I tried (and failed) this initially Enertion claimed I broke the warranty. This is a BS claim (at least in the EU where I live), but proving that is another headache. There were a few guides out there, but none of them …