Hi Zhaofeng, > Just wrote a driver for TYT TH-350, based on the code for Baofeng > UV-B5. Attached is the patch. How similar is this driver to the UV-B5 itself? In general it's much better to subclass a driver if you have just a few changes. I haven't tried applying this and diff'ing them myself, but wanted to ask you first. Thanks! --Dan