Update from ADB is a method used to manually install software updates on an Android device by connecting it to a computer and using the Android Debug Bridge (AD tool, typically while the device is in recovery mode. It is often used for sideloading OTA updates or troubleshooting issues.
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How To Apply Update From ADB | Full Guide for Android Users
techboltify.com

How To Apply Update From ADB | Full Guide for Android Users

Learn how to apply update from ADB easily. Step-by-step guide to install Android updates safely using ADB commands—no root access needed.