Quick Note: How to Enable USB Debugging on Android Phone

For the newer Android operating system like Android 4.2 or later,
You can enable USB debugging by the following steps:

Step 1. Enter "Settings", then, click "About Phone".
Step 2. Tap "Build number" for 7 times until you get a note "You are under developer mode".
Step 3. Then back to "Setting", then, click "Developer options".
Step 4. The last step, tick "USB debugging"

Can't access internal storage from a computer after installing Marshmallow on Android device?

Recently I have update my OnePlus One phone to latest version of Android 6.0 (Marshmallow)

After I have updated to latest version I can’t access internal storage how I used to access before. Due to security options in 6.0 there are few options that were changed to enable access.

Here's how I could able to fix it.

1. Open Settings
2. Enable Developer options:
   1. Go to About phone (or tablet)
   2. Scroll to the bottom
   3. Tap Build number repeatedly. After several taps you will see it count down and then say "You are now a developer!"
3. Back to Settings
4. Tap Developer options, near the bottom
5. Scroll down to and tap Select USB Configuration
6. Change it to Charging only
7. Tap Select USB Configuration again
8. Change it back to MTP (Media Transfer Protocol)

That's it. You should now be able to open up the internal storage on the device from your computer.

Hope this helps!!

Android Version History

The version history of the Android mobile operating system began with the release of the Android alpha in November 2007. The first commercial version, Android 1.0, was released in September 2008. Android is continually developed by Google and the Open Handset Alliance (OHA)

** Added for my own references