Looking into the updated 9.8 and found this very interesting in the 2022 Rail FAQ. Didn't see this mentioned in Rob's 9.9 excellent review.
Are software updates still required to be performed at the retailer?
No. The new Bosch smart system will do updates “over the air.” The new Rail with Bosch smart system is
regularly upgraded with new functions and always remains up-to-date – thanks to updates via the eBike
Flow app.
How often will over-the-air firmware updates be scheduled? Can riders revert back to a previous
version if they don’t like the update?
There will be multiple firmware updates per year. Updates on bug fixes and improvements in system
efficiencies cannot be reverted. Some updates on feature changes are reversible, for instance, riders
have the ability to revert from having eMTB mode back to the standard four support modes.
Is there an app with the new Bosch smart system?
Yes! The Bosch eBike Flow app gives both iOS and Android users access to numerous functions,
integrates other apps such as Apple Health and synchronizes activity data automatically. The Flow app
can now easily receive updates 'over the air' keeping your bike and app always up-to-date and with the
latest features.
Does your phone need to be physically connected to the bike to take advantage of the features?
No. Get on, start pedaling and the smart activity tracking of the eBike Flow app is activated — regardless
of whether the smartphone is in your pocket or attached to the handlebars. Thanks to the in-pocket
feature, you can keep your cockpit reduced to the essentials.
Is there any Trek customization within the eBike Flow app?
Yes. The eBike Flow app can recognize your Rail bike, customize the app display and help you find local
Trek retailers. In addition, there will be additional features unique to Trek in the future. Your over-the-
air app updates will include these features.
Can I customize the assist levels within the eBike Flow app?
Yes. The eBike Flow app offers user-defined assist modes. Support-percent and support dynamic can be
adjusted, while speed and max torque can be reduced (useful where speeds are restricted or with new
riders that need to build experience at lower speeds/torque).