Android

Howto

• Building your first app
• Remove PIN code on Android

Backup

• http://androidflip.com/how-to-backup-your-android-phone-before-upgrading-firmware/

Recovery mode

Hold volume down and powerbutton

Tools

adb

android-sdk-linux/platform-tools/adb

Better Battery Stats

get from xda

FAQ

Change sounds of notifications for apps

Settings->Apps & notifications->App info->App notifications

Check if locked or unlocked

fastboot getvar unlocked

will probably give you

< waiting for any device >

so boot into #Recovery mode and try again