As far as I know, there is no procedure. Maybe others can chime in. I'm an owner of a RB433AH, so I've been following this.
- the Mikrotiks on ar71xx have not been ported to ath79
- ar71xx was made "end-of-life" in June 2019 on the master snapshot
- I noticed that the ar71xx avalaiable under RC2 was last compiled on December 1st
See: