Android 5.1.1 Lollipop is a minor but significant revision of the Android Lollipop series, which was the fifth major version of Android developed by Google, spanning versions between 5.0 and 5.1.1. Following the release of Android 5.1 in March 2015, Google pushed out Android 5.1.1 in April 2015 as a dedicated bug-fix release, with a particular focus on resolving memory management issues that had plagued earlier Lollipop builds.
Once the device enters bootloader mode, unlock your bootloader (if not already done) by typing: fastboot oem unlock (Note: This wipes the device). android 5.1 1 update download
Factory images allow users to quickly return to or upgrade to a stock build of Android without waiting for an OTA rollout to reach their specific device. Android 5
Download the Android 5.1.1-based ROM zip file and the corresponding OpenGApps zip file (ARM or ARM64, variant "nano" or "pico" is recommended for Lollipop). Factory images allow users to quickly return to