S4 Mini: cannot perform software update

A little while ago, I rooted my S4 Mini and installed Android 5 custom firmware. However, my online banking app didn't like root, so I reverted back to standard firmware and removed the root. The phone works fine.

However, when running the OTA update, the phone tells me it cannot update due to root, and I should try using Kies.

I've installed Kies on my PC; plugging the phone in Kies tells me there is an update. It appears to download the required file but the phone does not update. I have tried with SmartSwitch also, but the same happens.

Can anyone please advise me on the following:

What is the latest official update for the S4 Mini; is it Android 5?
How can I update the phone? I thought flashing with Odin, but googling for various permutations of 'S4 Mini Official ROM, S4 Mini Android 5' etc. tends to yield results for the S4 and not the Mini...

Any help here would be great!

Can't perform a factory reset even in recovery

I'm using the Moto X (1st Generation) and running on CM12.1 on Android 5.1.1.

I wanted to change the rom to Dirty Unicorn. So I followed the normally process of changing roms by first going into recovery and performing a factory reset, wiping dalvik and etc... But when performing the factory reset., this error comes up. .

Everytime I perform a factory reset the apps are still around when I reboot. Any idea what the problem is.

Please help!!

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