Can't we modify our own phones with programmings we learned

Question

Example: Increasing our ram,optimising our processors,changing our phones operating systems,etc

Answer 1

We can't increase our ram.But we can do others thing by making interactive app using programming knowledge.

Answer 2

Then how do we program our ram

Answer 3

Phone is manufactured through codes so it'll be possible to program our own ram and optimise it isn't it ?