What have you tried?
- Checked md5 sum?
- What version of the ROM / Addons did you flash?
- Did you do a full wipe?
- Did you do a super wipe?
- Do you get an error notice, if so, what do you see?
WiFi hotspot does work for (some) others so you'd have to give more information.
Phones: 0) Pocketline Swing, Various Nokia's a 6100 e.g., 2 times a Siemens m35, Samsung a800 and a Motorola razr; 1) HTC Diamond (somewhere in a desk drawer); 2) HTC Desire Z (stolen by a filthy thief); 3) HTC Sensation