There is a problem connecting my keyboard with my desktop or PC, what should I do?

If you built it and the problem is mainly related to your PC, here are some suggestions:

1. Try to buy a dongle with a Broadcom chip inside.
2. Try to update the dongle's drive to the latest version.
3. Try to move your dongle a little bit close to the keyboard.
4. Try to buy the dongle from a larger, well-known brand, their dongles usually have better compatibility.
5. Buy the dongle from somewhere you can do fast exchange like Amazon because you might need to exchange it.