Default How to enable Long_Pound.lnk in 586w (AKU2 Rom)

I updated my USA T-Mobile SDA to Dopod 586w AKU2 rom. Long press the "#" key no longer switch between normal and silent profiles. I put a shortcut, Long_Pound.lnk, linked to mute.exe in \windows but still doesn't work.

Does anyone knows how to enable Long_Pound.lnk in 586w or the latest i-Mate SP5m ROM?

Thanks a lot.