I received three meters today (in Canada), and inadvertently did a firmware update on two of them while connecting with the app (on a Samsung S4 (Android 4.4.2)).
I downloaded the app today (Feb 17) from the Google Play store, with the following specs:
Updated 16 February 2015, Size 1.1M, Installs 1-5, Current Version 1.0.5

There were no issues with the app installation.
The original firmware version on all three was Build 1421369173.
The two updates went to Build 1418004830. See the screenshots here:

https://www.flickr.com/photos/33161108@N06/sets/72157648553445644/

The first screenshot shows two of the meters waiting to connect. The top meter is the original build xxx9173. The bottom meter has the “updated” firmware xxx4830.
The second photo shows the firmware update screen I inadvertently got while connecting to two of them (at different times). I tapped the “Start Programming” button and it went through the process smoothly on each one, taking about 6 minutes each time. I got to the firmware update screen by continuing to hold the probes together (after getting out of hibernation), while tapping “Connect” to load the interface.
I don’t know what the build numbers mean though. I thought that they should increment higher with each successive version. I left the third meter un-updated until I’m clear about what the firmware versions are.