Thanks for the above trick. I can now confirm the new orange ROM 22.214.171.124 works with SPV C500 + Holux GR-231. Those are the steps I followed. 1. don't rename BT to Tomtom Wireless GPS, paired BT to C500 2. install the anygpstweak.cab (by transfering it to \Storage\windows\Start Menu\Programs and run from C500) ---- thanks for TrickUK 3. Go to bluetooth setup>Menu>COMport - uncheck "secure connection" 4. run tomtom and select other BT - Walo.... everything working now.