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 v184.108.40.2061 (EastAsia)
Package Version: 220.127.116.111
Software Platform: 18.104.22.168
File name: 8220EastAsia_PBr4.6.0_rel471_PL22.214.171.124_A126.96.36.1998 _Indosat.exe
File size: 85.5MB