--- a/chirp/drivers/rfinder.py
+++ b/chirp/drivers/rfinder.py
@@ -287,7 +287,7 @@ class RFinderRadio(chirp_common.NetworkS
 
         self._rfp = None
 
-    def set_params(self, (lat, lon), miles, email, password):
+    def set_params(self, lat, lon, miles, email, password):
         """Sets the parameters to use for the query"""
         self._lat = lat
         self._lon = lon
--- a/chirp/drivers/uv5r.py
+++ b/chirp/drivers/uv5r.py
@@ -587,7 +587,7 @@ def _do_download(radio):
         data += _read_block(radio, i, 0x40, False)
 
     if append_model:
-        data += radio.MODEL.ljust(8)
+        data += bytes(radio.MODEL.encode('utf-8').ljust(8))
 
     LOG.debug("done.")
     return memmap.MemoryMapBytes(data)
