In order to manage the BB2 content, you must use BBMO 2.0.3b on a Chromium-based browser (Google Chrome, MS Edge, Vivaldi, Dia or Opera). Why? The new content is not backwards compatible with either the BeatBuddy Manager (BBM) or BBMO 1.5.6.
This is a screen shot from the BBMO 1.5.6 browser with an explicit warning
This is the web address for BBMO 2.0.3b https://bbmo-beta.dyhfwrcznxkz3.amplifyapp.com
Here’s another screen shot emphasizing the warning:
Here’s the web address: BeatBuddy Manager Online BETA
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Rather than try to open and manage your project from the SD card, you might want to download and unzip the latest BB2 content to your computer and use the BBMO 2.0.3b to manage your content on your computer.
You might be asking “will the BeatBuddy Manager (BBM) 1.6.5 be updated to work with BB2 content?” and the answer would be “no.” Although still available from Singular Sound, there is no longer any official support or development for the BBM Legacy.