We are using 4.8.5 from the Mobile Push SDK as mentioned in the following link: https://salesforce-marketingcloud.github.io/JB4A-SDK-Android/
Just wanted to check is it mandatory to upgrade the SDK to below version? If yes can you please let us know which version to upgrade? And what could be the issues if we do not upgrade from version 4.8.5
Version 4.8.6 Released April 13, 2017, correlating with the Marketing Cloud 206.3 release.
Version 4.9.2 Released April 7, 2017, correlating with the Marketing Cloud 207 release.