The back button of my Gionee s10b is faulty. Even when am not pressing it, it keeps prompting itself, taking me back to previous pages or to home screen and disrupting my activity. I want to solve the issue by upgrading to a higher OS but I can't even find a twrp for Gionee, let alone my model. Any suggestions as to how to fix the back button issue and to get a twrp for Gionee s10?