Wow, things just don't work for you like they do for me, my pc must be magic. Do this, download PuTTY. Set it up to Telnet to your Mio's IP address. Or if you have another Telnet program, use that:
(1) Telnet to box with PuTTY, login with: root
(2) Telnet Command: init 4
(3) FTP the new Timer.xml file to /etc/enigma2. (The file will replace the original file in /etc/enigma2.)
(4) Telnet Command init 3
init 4 sleeps the operating system so it'll take the new Timers file.
init 3 awakes the operating system afterwards.
Filezilla is a good program for doing FTP transfers.
OH, you said you "REBOOT" the receiver. Did you really mean reboot? You just need to restart ENIGMA, not a full reboot.