[Q] Fusion ROM 5.0.2 Galaxy S5 klte. Need Explanation On How You Update it. topic

Hi,

I have a stable and working Galaxy S5 klte with Fusion ROM 5.0.2.
It's overclocked etc and I'd like to know how to update my ROMl without losing my settings.

I used to run with CM12 5.0.2 but that was easy update with twrp and I still had my setting and the update.
I got twrp here as well and root obviously but I'm not entirely sure how to update this ROM.

Current Fusion verison: Fusion-v5.0-2015-01-27

Dowloaded:
Fusion-v5.1-2015-02-07-fusionsp_klteusc.zip.md5sum(0,13kb)
Fusion-v5.1-2015-02-07-fusionsp_klteusc.zip(252.42 MB)

I just need to know how to install this and keep my settings because my current ROM is very stable and the kernel is up to date.
A little info about what's on it and working:

Working: Camera(amazing photos and 4K recording), NFC, Bluetooth, WiFi, LTE, Viper4android(amazing sound/surround.) And all basic stuff like calling/messages.
No crashes, lags or stutterers. It's smooth like butter(smoother than any iPhone, 6+ and note 4(testet it).
All my apps/games are working perfectly and smooth.
Specs:
klte 5.0.2(obviously) running Nova launcher, usually 1,1gb RAM available.
Antutu benchmark 47.XXX evern up to 48.XXX went above Note 4.
I/O scheduler: vr
CPU: 2,764 MHz
GPU: 657 MHz
DPI: 528
Governors: usually on performance with great battery life and not overheating.
Fast charge enabled and fully working.

I will appreciate it so much if I get an detailed explanation on how to update my ROM but still keep my settings.