Reset frp? G530W Galaxy Grand Prime – Custom Binary Blocked By FRP

Hello all, I used the kingroot app on my galaxy grand prime g530w ( not the computer version ) and it tripped knox. Now when I boot my phone, it says ‘Custom binary Blocked by FRP, secure fail: kernel.’

Can I use the miracle box program to reset the frp lock?

Does using the reset frp function wipe my data? I need all my data on my phone. I don’t want / need to lose any data.

If the reset frp wipes data, how do I backup all of my data before doing the frp reset?

Thanks! It’s much appreciated.