[RIIM] In order to program the radio module correctly, what pins do I need to use?

It is enough to use just UART and ground (TXD, RXD and ground,). These are the essential pins that need be controlled during programming. You may also need Pin number 4, which is explained in the next question: https://radiocrafts.com/kb/riim-how-can-i-use-pin-4-the-bsl-pin/

Last Update: September 29, 2021