Also Check Out How To Install Android 5.1 on PC with windows On Techno Planners. The new Android 5.1 Lollipop comes with many new features :
Up to 4x performance improvements.
Faster then Previous 5.0.2
Wifi and Bluetooth Working perfectly fine
PlayStore and Google Apps Pre-Installed
Much better than previous 5.0.2 Update
Many other important Bug Fixes
Support for 64-bit SoCs using ARM, x86, and MIPS-based cores.