I reinstalled graphene os. And now I discovered you can make rss feeds from youtube channels with the https://www.youtube.com/feeds/videos.xml?channel_id=[channel_id], where [channel_id] is a unique identifier for the channel. Looking for a way to activate rss feeds for this forum now.
Edit: I replaced google play books with PocketBook (offline) and google speech recognition (offline). One comment on Plexus said turn off network permission after downloading the languages. And it still works!