Navigate to Settings → System → Developer Options → "Peak refresh rate" → Select Auto (120Hz/144Hz). Do not select "Standard" or "Battery saver."
If you rush into the android 41 2 update download extra quality without prep, you will end up with a bricked device. Follow this checklist: android 41 2 update download extra quality
Android 4.1.2 introduced TRIM support. Download LagFix (fstrim) from the Play Store (if still accessible) or run via ADB: Navigate to Settings → System → Developer Options
adb shell
su
fstrim -v /data
fstrim -v /cache
fstrim -v /system
This restores write speeds on old NAND chips. “Downloads fail on VPN/tethering”:
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