Help Re-install android on ZTE T815/Tempo ?

[ANDRO_Researcher]

As the title suggests I'am trying to re-install Andriod but their are several criteria that are preventing me

1. the Android operating system boots but upon passing the lock screen, all core processes such as launcher crashes meaning i'm unable to change settings (Even though sometimes I'm able to change the settings it just reverts back upon Reboot and the settings don't even work properly)

2. ADB does not detect the device (assuming because of USB Debugging)

3. Tried Android safe-mode it does pretty much the same thing as normal mode

4. Tried a factory reset but it just reboots and shows the Android recovery options instead of erasing

I'am currently out of options Please help

BTW I wasn't trying to install any custom roms, Just happened randomly after a reboot

Thanks in advance

 

[bcrichster]

Did you install any apps recently before it began behaving strange? Root..??

 

[ANDRO_Researcher]

Well i did root with Kingroot but it was ages ago and it was successful but no I only rebooted and it happened