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 v126.96.36.1991 (EastAsia)
Package Version: 188.8.131.521
Software Platform: 184.108.40.206
File name: 8220EastAsia_PBr4.6.0_rel471_PL220.127.116.11_A18.104.22.1688 _Indosat.exe
File size: 85.5MB