so i have a google nexus 7 2013 rooted with android 4.4.2 or something. it wont charge so i tryed doing a reset, guess what? i deleted the Operating System!!! i have TWRP but no backups. had just deleted them! so i need help now because tomorrow i have school and need this device for it! please help me. i am new to this kind of stuff. do i adb sideload a custon rom and try to install it or what?if so how do i do it? im downloading one now. man i ust want my devce back!!?AND i onLY hAVE 2% battERy lEFt