This is how i changed the air filter on my 2019 cb500f. Remove the battery. Remove the air box snout two screws and remove the snout it just gives more visual access. Remove the wiring plug that's fixed to the air box on a bracket one screw, then remove the bracket off the plug just for easier fiddling of the wiring. Lift up the ecu of it's bracket and lay it flat which makes it easier to remove the air box lid. Remove the four screws that hold the lid to the airbox and lift the unit out. Replace the air filter and reassemble in reverse order.