[Q] Reset S5 help
So I got a new S5 today upgrading from a 3.
Everything was all good, rooted, downloaded titanium backup and I believe accidentally restored something from my old s3. Anyway, after a reboot. the phone starts into touchwiz for a few seconds then reboots mentioning acore has crashed.
I have tried flashing CWM but it does not seem to go into its recovery, instead staying in the stock download mode.
ANY help would be much appreciated, I've downloaded the stock UK O2 firmware from sammobile but i'm lost on what to do next/