Here is the video showing it:

I bought the USB JIB, quite a while ago, from eBay, and never really used it on my I9000 – I thus got curious about using it + the flash counter on the I9300.

All-in-all, the S3’s flash counter doesn’t get reset, but the JIG works in booting the S3 straight into download mode, which is exactly what I bought it for (a safety net).

Hope this clears up some things!
–TotallydubbedHD