Leaked European firmwares for Samsung Galaxy S Apollo are already available on SamFirmware.com. If, you one of those geeky kinds and have no problem with rooting and flashing new ROMs, this might be the right time for you to get FroYo on your Samsung Galaxy Apollo.
There are four leaked ROMS available for download, you can apply the latest to get the least bug prone version.
Download ODIN, OPS file, and the ROM and apply to the get awesome FroYo sweetness right now on your Galaxy Apollo. All downloads available on Samfirmware.com. If you are not sure about what you are doing, do not do it else you might brick your phone.
After you download everything, switch off your Galaxy Apollo.
To take it in download mode, press Volume Down key + OK key + POWER key.
When your phone is in download mode, connect it to USB cord, run ODIN.
Select OPS File, and Images to flash, if you have single file select the single package option, else select individual files.
Then click start and wait for time to finish it flashing and you are ready to roll.