Cant connect nicenano v2 split keyboard with bluetooth anymore

[twin lava]

Double-pressing the reset button is how you get into bootloader to reflash.

Which profile are you attempting to use on the keyboard?
If you don't know what a "profile" is, you definitely want to check the documentation: https://zmk.dev/docs/behaviors/bluetooth#bluetooth-pairing-and-profiles

[twin lava]

Did you buy this keyboard from AliExpress?

Linking to the listing would help.

I have an idea of which keyboard you have, and if I'm right it's not wired like a normal Sofle at all: https://github.com/a741725193/zmk-sofle

You can contact the seller for support, but I'm guessing it's the repository I linked