I've been reading all day about how to SIM unlock my I9305 UK 3 Hutchison 4.1.2, and I'm getting somewhere, but feel I've hit a dead end with the sources available online and here. If I've missed something obvious I'm sorry! Would really really appreciate some guidance on where to go next.
I need to downgrade from 4.1.2 to 4.1.1 to do the simple unlock trick from the phone dialer code, but the first impediment is I can't find any UK 3 Hutchison firmware for the I9305 anywhere, not on any of the main firmware sites (http://www.samsdroid.com and http://www.sammobile.com) or here on XDA forums, or using Google. Neither 4.1.1 nor later versions.
So first off, if anyone knows where to find that then I guess I'm sorted? Even if I found 4.2/4.3 then I think I could downgrade to 4.1.1 using any carrier's firmware, then sim unlock, then flash the newer 3 Hutchison firmware and be ready for OTA 4.4, right?
If not, I need to know the implications of flashing a ROM from a different region/carrier. I'm going to sell this phone, and Kitkat might be coming out soon, so I need it to be able to accept OTA updates, and this is what I can't find clear answers on.
The ROMs I can find are:
non-UK, non-3, stock 4.1.1 firmware at samsdroid.com, a few versions from different European countries, all from a particular Euro carrier.
And from here pre-rooted UK 4.1.1 EE carrier firmware. My reading suggests that the rooting shouldn't be a problem, that an OTA update will unroot it, which is what I want. But they're not 3 Hutchison.
So what 4.1.1 ROM is best to flash, and how do I get it to a state where it will accept OTA updates?
I think that covers it, let me know if anything isn't clear.
Many many thanks you lovely people!