In spite of..
The app works, but 1st do yourself a huge favor and register through the app-portal, not the app itself. The app and the Power2max website have the app-portal pass through. Once you register yourself, you can register your power meter. Then login to the app with your email and password you registered with on the app-portal. I did this and it worked. I was able to update my firmware and even register another power meter. The app seems to work fine now, and though both firmware updates stalled at times, I just killed the app and started over. Also the iPad app seems better than the iPhone app, but the iPhone did install the updates. Good luck.