Flow app crashes after bluetooth configuration

Using a Samsung note9 with Android OS 9 and Bluetooth 5 should work according to spec. But it does not 😪

Clean install of the Flow App does work, but as soon as I am connected with my ebike (even see on my Kiox display successfull bluetooth connection) it crashes. After that it keeps crashing, even after restarting phone, erasing cache, removing bluetooth coupling. Removal of app etc and clean install repeats this pattern.

Installing older Flow versions does not solve this (same pattern)

My tablet does connect without issues, but my WiFi range is not that good 😑

Bosch recommends upgrading the OS > 9 of my phone ( ridiculous if OS 8 support should work according to their specs). And of course , upgrading to OS 10 is not possible anymore for my phone. Alternatively Bosch recommends to use another ( newer) device which does support OS > 9. Yeah right...

Any other solution or work around?