Is it possible to re-install Android OS When the OS is practically useless
Short answer is yes!
Long answer:
you can Flash* Android &quot;Stock Rom&quot; for almost any type of android devices, even if the old one isn't loading at all.
as long as the hardware doesn't have any problems
but there is some problems
1. To find the stock Rom:
you will find it with a little search depending on device manufacture
2. To flash it without breaking your device:
this process can be very risky and highly depend on device type
3. you will lose your warranty
safest way is to find a near service center to do it for you
but you can find very useful stuff here:
https://forum.xda-developers.com/