Just completed download, config, build and install of Merlin 2.1.x firmware for my Creality Ender 3 Pro with a v4.2.7 Motherboard and TMC2225 Driver (for Marlin 2.0.1). I followed this video for install guidance, then did a bed leveling procedure.

However, at this point Octoprint is throwing an error stating that…

Your printer's firmware supports host action commands, but they are disabled. The firmware will not inform OctoPrint about job pause & cancellations, filament runouts, and similar firmware-side events. If you want this functionality, you need to change your firmware's configuration.

So, when I get home next week it looks like this will need more attention.