Need a wee hand if anyone can help.

Right I'll start off by saying I'm a noob, like a really nooby noob, but, I can learn and learn quick, here's my predicament, I bought a phone off a guy (how many times has this scenario played out) and it turns out to be an s7 clone... mmb29k.g935fxxu1apava ...now it's not a bad phone, I've had worse and I don't need them to do much...but this phone has me so frustrated it's unreal, now I know "**** one Mick, you got caught lovely" but as a logical thinker, it still has the general workings of a ****in' fantastic phone, excuse the language, so I'm on here to see if anyone can help me make it good or point me in the direction to learn from scratch how to do it myself, maybe not exactly designing my own ROM yet, as I haven't a clue about any of it, but at least getting workable ROMs already created and loading them onto it. I've tried the s7 version of some fire type ROM but when I downloaded and prepped all the required files etc, I went to the boot screen and selected the correct file from sd card just like the video (which I must point out there were vast differences in the boot screen) anyway, the ROM started then abandoned, I tried again a few times but same result, I then wiped and reset factory settings and tried again...still nothing, so I set off on a mini-mission and ended up here having found out at least that the phone IS a clone, what type of clone and also the specs on it.

Any help would be much appreciated.

Pardon the language and apologies for the the rambling.

Mick.