If your device is soft-bricked, you can attempt to flash the using the Smartphone Flash Tool
: If you have the US variant, the AT&T software version is the most reliable for cellular connectivity and OTA updates.
The second screen becomes a useless black slab. This is a one-screen phone after flashing.
If you are searching for the for everyday reliability , install LineageOS 16.0 (Android 9) . It provides the smoothest dual-screen experience without the overheating of stock Android 7.
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