Select "Wipe" > "Advanced Wipe." Check Dalvik/ART Cache, System, Data, and Cache. Do not wipe Internal Storage if your ROM is saved there.

Look for a Nougat-based ROM on the XDA Developers forum for your specific device.

If the device gets stuck on the logo, go back to TWRP and perform a "Factory Reset."

Go to Settings > About Phone > Tap "Build Number" 7 times. Then, in Developer Options, toggle USB Debugging "On."

Once you have downloaded the Android 7.0 ROM file (.zip) and the matching Google Apps (GApps) package to your SD card, follow these steps:

A power failure during a flash will "brick" (destroy) your phone.

To move to Android 7.0, you need to complete these three steps in order: 1. Unlocking the Bootloader

Before touching your system files, you must prepare. Moving from KitKat to Nougat requires wiping your device.

This is a "Status 7" error. It often means your TWRP version is too old. Update TWRP to the latest version and try again.