I recently acquired a brand new TYT MD-390 to monitor local TRBO channels (both my 436 and 536HP are tied up monitoring trunked systems and buying another x36HP is out of the question). However, I quickly encountered issues with receiving the channels. Despite having the correct slot and color code, the radio won't decode the signal. It'll show that it is receiving, with the RSSI at max and the green RX light illuminated, but there is no audio. I also tried an MD-380 but had the same result. I do have the DMR upgrade installed on both the 436 and 536, and they received the channels fine.