Since upgrading past 4.3, my Iphone 4 has become really unreliable. Its been crashing apps for fun and the interface lags/locks for a few seconds at random times.
I've wiped it and started from scratch with a clean install (no backup restores) and its still acting like above
Its got to the point where I want to roll back to 4.3 which worked great.
I've tried this ... http://www.redmondpie.com/downgrade-ios-4.3.1-to-ios-4.2.1-4.1-4.3-4.0.2-4.0.1-iphone-4-3gs-ipad-2-ipad-ipod-touch-how-to-guide-tutorial/
... but it wont let me install the 4.3 firmware. It tries and then fails with an error 3914 i think. I've tried on my desktop and laptop with latest 10.2.2 itunes.
Can anyone help me get back to 4.3?