Mini 3 Pro firmware update without Fly app to .300

Have a drone with .150 installed. The upgrade wants to go to .400. I want .300 at least because it resolves some bugs and adds function. But I do not want to go to .400 because i want to avoid remote ID, and eventually when drone hacks releases the NFZ certificate unlock for this, possibly be more compatible with that.

  1. How do I get the .300 firmware
  2. How could I update the airplane outside of the Fly app because the fly app asks to go straight to the latest (.400)?