device offline Error while Installing APK (How to Fix) offline
Error while Installing APK

The problem is that ADB is killed, just restart it
There are three ways:
1. Plattform-tools can be found in the SDK file, and adb can be found in this folder.
Double-click ADB to restart it

Second, you can also perform a two-step command operation in CMD:
1, the adb kill server
2, the adb start – server

Restart the computer

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