It's a 4G card set to FAT32.
The SX30 was released in 2010. It will only autoboot from a FAT16 partition.
I had no luck getting STICK to run and it doesn't seem necessary anyway. I have the correct firmware update, it works.
STICK does more than check the correct firmware version. It will also format your card correctly, download the correct distribution file, install it on the SD card, and set the card to be bootable.