Hello
after months of researsh, finally I did update my F500BT US version from V2.06 to V3.0
Try to follow exactly this thread #381 http://avic411.com/index.php?/topic/27807-fx31-complete-firmware-image/page__st__375
the link from raoidshare.ru for WINCEIMG.BIN and WINCEIMG.CKS is not working
I upload the file on:
http://www.mediafire.com/?dem8wi4s7d5h6cu
http://www.filesonic.com/file/827534291/WINCEIMG_F500_6.5.0.6_for_3.02.rar
https://rapidshare.com/files/458834242/WINCEIMG_F500_6.5.0.6_for_3.02.rar
Goog luck