Storvay said:Absolutely, that's what I did and very many others here.
Just head over to xda ([Stock Official Firmwares] I9300XXBLG8 (4.0.4) - United Kingdom (BTU) [27-07-12] - xda-developers). Download the firmware and flash with ODIN as instructed. Watch a few Youtube vids as well if you want to make triply sure you're not going to mess anything up. Very easy to do and does not require root.
Also look at the post when it talks about CSC. You will need your CSC to be BTU (I think the firmware on that thread is, indeed, BTU) if you want to receive OTA updates or to be able to update via Kies.
HTH.
Jakks said:I've successfully flashed mine and it's works a treat
I was on the 3 branded I9300XXALF2 Build Date: 5 June 2012 so i downloaded the stock I9300XXBLG6 Build Date: 20 July 2012 and flashed it via Odin then once rebooted changed my CSC from H3G to BTU, finally loaded up kies and was prompted to update to I9300XXBLG8 Build Date: 26 July