Looks like Indosat released an official OS for the Flip users. This is the same as the OS that was leaked a while back, but still install at your own risk!
BlackBerry Handheld Software v220.127.116.111 (EastAsia)
Package Version: 18.104.22.1681
Software Platform: 22.214.171.124
File name: 8220EastAsia_PBr4.6.0_rel471_PL126.96.36.199_A188.8.131.528 _Indosat.exe
File size: 85.5MB