I'm very interested in the Recent RS-918 and supposedly the 2018 model has 1MB of memory allowing it to use the latest firmware. I see there are two new models, the RS-978 and the RS-958B, which have internal batteries. I heard there's a problem with the RS-928 Plus having a different oscillator which causes issues with firmware. Does anyone know which oscillator is in the 978 and 958B? I've tried contacting the MFG and eBay seller, but haven't gotten a response. Could anyone share their experiences with these radios?