Samsung Galaxy Alpha users are still waiting for the official android 5.1.1 lollipop but folks at XDA developers have churned out un official ROM that brings lollipop to our devices.
This ROM is based on many projects like AOKP, CM, PA,OMNI and original Remix firmware for the Galaxy Alpha.
Android 5.1.1 Lollipop ROM for the Galaxy Alpha: Installation instructions
Required: Stock Firmware 5.0.2 preinstalled, ROM + Gapps (download links given below) saved in Internal Storage, TWRP Recovery v188.8.131.52, Root Access
Backup: go to custom recovery and create a backup of your current ROM
Wipe /system, /data, /cache, dalvik cache
Install ROM + GApps
Restart your phone.
Android 5.1.1 Lollipop ROM for the Galaxy Alpha: Main features
Material Design – clear user interface
New Lockscreen – Notifications are now displayed directly on your device’s lock screen.
Battery-Saver Mode – … promises to squeeze 90 extra minutes of juice out of the battery in your device.
Notification Control – classification into three categories (NONE, PRIORITY, ALL)
Smart Lock – automatic deactivation of device lock
User Management – Create new user accounts, or use guest mode with friends.
Keep Apps Pinned – Pin a specific app to the home screen.
Improved Quick Settings – You can quickly adjust the brightness, an rotation lock option and a built-in flashlight, among other features.
ART Runtime – improved performance and battery life
Heads Up Notifications – Pop-Ups for incoming calls, messages etc.