22
Try using
redis-cli --raw
It solved problem for me.
"\xc3\xa0" is just Unicode "à" in UTF-8 encoding. Just decode the string and you're done...
You need to spec the version of Redis and more importantly the client you are using.
If you are using a telnet client, the problem may be your client. Redis supports arbitrary bytes for values and UTF-8 is not a problem at all (if your client is properly converting the entered glyphs to the associated byte sequence.)