Wes, thanks for your effort. Installing Roon Remote legacy version 1.8 build 1126 did not solve problem. Launching Roon Remote from Android tablet generated response ’ Roon is trying to connect but Core and Remote running different versions. Nucleus core 2.0 build 1128 production. The configuration since 4/2021 Nucleus and Android tablet. This configuration worked until this week, a two week period of inactivity preceded issue. Suspect Nucleus version since 4/2021 other than 2.0. If set will newer versions of core be uploaded automatically to Nucleus? Do Remote and Core both require 2.0? If so any chance Android 7.0 can run Remote 2.0?
You need to run Roon 2.0 or Roon 1.8 Legacy on all of your devices. You can’t mix and match. You can only run Roon 2.0 if ALL of the devices you want to use meet the Roon minimum standards. Wes posted a link to the requirements.
If I check the current app requirements in Googles app store, then Roon Remote (1.8 Legacy as well as 2.0) are listed as compatible with Android 5.0 and higher (and are installed and running here on Android 7.0). The new Roon ARC app however is listed as compatible with Android 9.0 and higher (as announced by Roon).
So by that, you should be able to install Roon Remote from the app store (or use the APK download from Roon’s download page).