The newest version is "GEEWIZ MEDIA 4.5 SCH-I500 JDQ39 JELLY BEAN 4.2.2 ROM/KERNEL", and the reason I want to update is that it "Fixes issue with low headphone/headset output volume", a problem that I experience.
Can I do a dirty flash over the old one? There are three files in the download section. One is clearly a full wipe, but I am not sure which of the others I need to use for updating:
ODIN Compatible Downloads
GeeWiz Media 4.5 ROM/Kernel/Modem/Recovery/Data Wipe Full Update (ODIN)
This will delete all user data from your device, replace your RECOVERY with GeeWiz Recovery as well as replace your modem with the EH03 revision. Your data volumes will be formatted with EXT4 on the first boot
GeeWiz Media 4.5 ROM/Kernel (ODIN)
GeeWiz 2.9 Recovery (ODIN)
Thank you for any pointers on this. I've only flashed once before (the current ROM), and the searching I've done on my question is not giving me a direct answer.