Is it possible to downgrade the Multy X firmware

chip

Is it possible to downgrade the Multy X firmware? I would like to go back and try 2-3 prior versions for testing purposes. I'm experiencing major issues trying to cast to my Google Chromecast audio speaker Groups and I would like to test prior versions to role out a router firmware issue.  

My specific issue appears when I have more than 1 Chromecast built-in Sony speaker playing in the audio group.  My setup was working great until around end of November (I think).
I thought it was Pandora's problem but the router mesh is next to test. 

Thanks

#MultyX_Mar_2019

Hanamichi

Can you explain more description/information about the problem you meet?
Any screenshots, steps or symptom?

chip

Update: I confirmed my issue is not related to Multy router and I no longer have a need to test downgraded firmware. I tested this setup with my Netgear nighthawk router with the same problem behavior. Im off to figure out if it's Pandora or Sony.  Leaving the rest here for sake of others.

Issue is the Pandora audio cast is choppy or does not stream music at all and disconnects from the cast session. 

My issue occurs 100% of the time when all of these are combined:
1. with Pandora only (Spotify, Amazon, Deezer, Google Play music, all work fine)
2. using a) current version of the Pandora Mobile App to cast  Or b) asking the Google Home to start playing music 
3. the Google Chromecast Speaker Group being used to includes (2) or more of the Sony HG1 speakers.  

I have (3) Sony HG1, (1) Google Home, (1) Polk Mini MagniFi.   For the past 2+ years, I've had no issues playing Pandora to the speaker groups including all 5 speakers at once, individually, or grouped in pairs, etc, as they are throughout my house.   

I have recently confirmed my issue IS directly related to Pandora's latest versions of its Mobile app because using a prior version of the Mobile app does not have the casting issue. However, that doesnt explain the issue occuring with condition #2B above, when starting the music stream from the Google Home, because it is not using the mobile app at all. 

Hanamichi

Thanks for sharing.
So, is there the problem with the latest version of Pandora Mobile App?