Hi @Marnick ,
What do you mean with module is sending but in TTN there is no data?
As for the , I tried upload ABP example with RUI 4.0.2 then input AT+DEVEUI=? but I didn’t see . Is this repeatable scenario? Dont you think it is terminal software related? Also why you inquire DEVEUI? What you need in ABP is DEVADDR.