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 v18.104.22.1681 (EastAsia)
Package Version: 22.214.171.1241
Software Platform: 126.96.36.199
File name: 8220EastAsia_PBr4.6.0_rel471_PL188.8.131.52_A184.108.40.2068 _Indosat.exe
File size: 85.5MB