A project I want to start is modifying a feature phone like a Nokia 215/216/3310.
I'm looking to make modifications to the operating system. I know it's written in C/C++.
I also know they use MTK ARM processors.
My question is before I start, what's a good way to decompile the OS/firmware?
Would it be using an MTK flash tool, backing up then hex editing?
Awaiting some advice 