Installing an upgraded Android O.S.

I'm having a bit of difficulty finding a "good" tutorial for upgrading the O.S. on this phone. Right now, it has Kk 4.4.2 and it's corrupted. So, here's what I need to accomplish ...1. find a good tutorial for this particular phone that explains what must be done IN ENGLISH...2. Must be able to use computer to complete task for WiFi on phone is not working properly and thus, no O.T.A.'s. 3. I understand there are upgrades up to and including Oreo for this particular model and would need to know where to D/l O.S. from...i.e. safe/reliable site!!! I'm pretty much a noobie to phones, but am competent with comps/laptops. just saying...if the instructions are straight-forward and clearly written, I should be able to accomplish a flash. Appreciate any good advice/help that is passed along!!!
[BLU Studio 5.0C HD~Kk 4.4.2~Custom build version BLU_D535U_VO3_GENERIC]

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