This firmware upgrade needs to be done manually. It is not automatic unlike most of the Victron firmware updates.
The Victron Smartsolar controllers have two different types of firmware: the general firmware that controls the basic function of the controller and the Bluetooth interface firmware.
For my 100/20 controllers the latest general firmware is v1.59 and the latest Bluetooth interface firmware is v2.41.
Any general firmware update is automatically loaded on the first connection following updating the app. The Bluetooth interface firmware is not automatically updated and this must be done manually to gain the new features.
To update the Bluetooth interface firmware:
Click the three dots on the top right of the app.
Select “product info”. This will show the version of each of the firmware installed.
Below the Bluetooth interface firmware will be a notification that this is not the latest version, with an option to update this firmware.
Select update and follow the prompts. The update is easy.
When the update is completed a message box will ask if you want to enable the new features this firmware upgrade produces.
The main advantage is that following the update your tablet should be able to connect to all the Victron solar
controllers (and other Victron devices) simultaneously. This means the output from each of the solar controllers can be seen on one page.