@toddsantoro I've survey with carefully . devices (same devices that i used before) are in certain places (before update and after update) and i dont move and i dont change hardware. but before i dont have any error in connect to gateway and any error NACK for commands! but after update i have many error NACK and for first connection to gateway i have some errors !TSM:FPAR:FAIL !TSM:FAILURE TSM:PDT i think there are a problem about mysensors lib 2.1 my radio (if this is chinese or other countries) before update work very well. but after update....