Can I ask if the limited data pack of 2GB isn't the cause of the wifi problem?
Second, are these Linux apps? And I do understand your problem.
But still you will have to make a decision, whether you want to try recover the previous installed OS, which will be rather complicated, seeing the previous attempts you made with the other volunteers or reinstall the OS but have a loss of the already installed apps.
Yes, reinstalling will be difficult for you, expecially with the limited data pack.