23. How to do when the Tidal stops working after firmware update?

A: As for this case, please try to do a factory data reset by Settings on the M6 firstly, then please test Tidal app again. Or please go to Settings->General->Apps->Tidal->Storage, and then "clear cache". After done, please test Tidal again. 

Hope our advices can help. 

Btw, the latest version for the Tidal is 2.11.4 now: click here  

You can copy this apk file of the qualified app to the M6, then open the File Management app, locate and click on the apk file to install it.