As you can see in the above screenshot, my Nokia X2 has notified about availability of a new software update. The latest update takes Nokia X2’s OS version to 2.1.0.012 and seems to be only 2 MB in size. So, most probably it fixes bugs from the earlier major update 126.96.36.199 and improves performances. But the changelog accompanying the update notes,
Improved phone features
General performance and usability improvements
So, in absence of a detailed changelog, we need to dig to find out what phone features have been improved. Do let us know if you find anything new.