Hey, sorry i didnt check back here after my last post.
Headphones have worked fine since the update, so second reboot required.
Some instances see the camera perform considerably better, others with little to no difference.
As far as downgrading/replacing the firmware goes, im going to investigate some more when i can convince my wee brother to let me have a look at his gs3 properly as he has a completely different firmware to me (phone supplied by 3UK with 3 custom firmware).
If i can find the correct files i will attempt to flash his firmware to my phone and flash mine to his and back again.
Yeah to rephrase my point about the screencaps.
When you hit check camera f/w what it shows you is;
Camera current firmware version.
Available firmware version on the phone.
If these two are different then you can flash the newer firmware shown to be on the phone to the camera using the appropriate button. Otherwise i dont think it does anything.
Sent from my GT-I9300 using xda premium
Motorola Milestone - CM 7.1.0-RC12-11.07.14
LG Optimus 3D P920 - LGP920-V10d-JUL-08-2011
Samsung Galaxy S3 GT-i9300 - Stock Jelly Bean JRO03C.I9300XXDLJ4