Welcome to the forums!
Your best bet is to reload the firmware - look
here
- boot into Fastboot mode (with the device completely off, press-and-hold Volume Down + Power)
- connect it to your computer
- download Fastboot.exe from XDA
- run "fastboot oem unlock" from a Command prompt (elevated to Administrator privilege) (this WILL wipe your device)
- then extract the contents of the firmware download and run the "flash-all.bat" file
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