Bought an iPhone Clone In Myanmar / How To Flash New ROM

I recently purchased an iPhone 6S clone while in a small dusty market in Myanmar (Burma) near the border with China.
I'm a total Android noob but overall fairly techy. The device runs slow & constantly says it's running out of space.

It claims to have "iOS 9.3 (13E234)" installed but we all know that ain't true. So after installing CPU-Z i found the below details:
model: NGAJ2CH/A
kernel: armv7l

I have successfully rooted with KingOfRoot.
Now, what do I need to do to get this fake iOS off & a clean Android install onboard?
BONUS! call me crazy, but is there a way to check for and/or wipe any possibility of hardware-based keyloggers?

Full screenshots of CPU-Z's analysis are attached below:

(i am on a Macbook so any tools that are needed, i hope Mac apps exist!)

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