I haven’t used that e reader in 3-4 years, but I remember using ublock to kill some of the scripts they had to allow me to copy/paste into my notesheet and stuff like that. It also made it slightly less shit to read
I’m not really able to help out right now beyond what I said, but fuck cengage, their books were such a pain to read. Fuck paying 120$ to rent that sack of shit for 90 days.
Good luck with this.