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+====== Useful App for Android ======
+  * PC mirror screen for android:
+    * scrcpy.exe: https://github.com/Genymobile/scrcpy
+      * setup on androidL
+        - enable developer option > USB debugging (not developer setting)
+        - if developer option not visible, go Settings > About phone > Software Info - tap build number 7 times
+        - then, Developer option should be visible now, then enable USB debugging
+====== Problem and Fix ======
+**Stop Phone make screenshot, take photo, call emergency in your pocket**
+  * Setting > search "Motions and Gestures" > turn off Double tap to turn on screen, and turn off Double tap to turn off screen
+  * Setting > search "Smart Lock" > On body dectection > turn it off
+  * ref: https://www.samsung.com/sg/support/mobile-devices/how-to-prevent-pocket-dialing-on-samsung-mobile-device/
+====== Customize ======
+===== App Customize =====
+**Disable Chrome android suggested site and suggest article**
+  - go to this hidden setting page for Chrome <code>chrome://flags</code>
+  - search ntp, and change "enable-ntp-popular-sites" and "enable-ntp-remote-suggestions" to disable
+**Disable channel in wechat**
+  * go to wechat setting > General > Manage Discover > switch off Channel, (Mini Programs, Top Story)
+====== Backup, Reset to Factory, Restore ======
+  - Backup:
+    - install "Easy back and restore" app:
+  - Copy the back to a SD card, or OTG USB drive, or online storage
+  - Reset to Factory
+  - Restore
+    - install "Easy back and restore" app, and load the backup data
+  * apk extractor:
+    * https://play.google.com/store/apps/details?id=com.iraavanan.apkextractor&hl=en
+====== Backup Steps Manually ======
+  - Note down the list of App you installed, and each app login information
+  - Backup internal storage folders, go through one by one.
+  - check each app that stores data separately, and dig out to external storage
+  - take out SD card and restore to factory
+====== File Path of App File ======
+  * QQ <code>\Android\data\com.tencent.mobileqq\Tencent\QQfile_recv</code>