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 v188.8.131.521 (EastAsia)
Package Version: 184.108.40.2061
Software Platform: 220.127.116.11
File name: 8220EastAsia_PBr4.6.0_rel471_PL18.104.22.168_A22.214.171.1248 _Indosat.exe
File size: 85.5MB