Issue with nice!nano clone on SNAP75 keyboard

[glad solar]

Hello !
I recently bought a snap75 and two nice!nano clones from aliexpress (my apologies)

The problem is that I can't connect my MCU to my computer (or phone) even though it appears in the bluetooth device list

Here is what I have done to make it work :

• created an empty repo called zmk-config

• initialized zmk with options SNAP and nice!nano v2

• let github action build (it succeeded)

• used the out uf2 from the frimware zip to put it in the nicenano

• tried to connect it via bluetooth (this step doesn't work)

I think that it is useful to say that I didn't connect a battery to it but I have also tried wiring it and it didn't work either
here is my repo
I have a picture of the description of the package

Thank you in advance for helping ❤️

[dark vine]

does the left half work as a USB keyboard when connected over USB

it should be able to type

[glad solar]

It's the thing I don't understand, it doesn't work even over USB.

[dark vine]

Does the left half show up as a USB device at all when you plug it in? It should be listed as SNAP.
In any case, I would suspect some kind of assembly problem.

[glad solar]

No it doesn't show up in the USB device list,
Any advice on where to look if it's an assembly problem ?