Since digital photography overtook traditional analogue mediums, camera designs have evolved dramatically over the past couple of decades. With more power processor designs, cameras have become more computer-like. That means that you can potentially 'upgrade' the camera's features and functions by flashing new programs in (like an OS upgrade on a computer).
But often camera manufacturers don't like this approach, because it cost time for the engineers to 're-engineer' the software that controls the camera, but more importantly, it may affect people who are waiting or wanting to upgrade to future models. Hence, you don't see big boys Nikon/Canon/Sony do this often. They do 'add features and bug-fix' periodically to add stability and compatibility but not a over often an overhaul.
Olympus has just done the opposite, essentially giving its loyal customers a brand new camera by introduction a completely redesigned software engine, bringing the now-3-year-old EM1 Mark II up-to-date in 2019. Ok, there are still certain limits due to the age of the processor and sensor, but it now performs as good as its new flagship - OM-D E-M1 X.
Watch the video and you will find out the important changes in this Firmware 3.0 after intensive use by Jimmy and Tracey in professional environments.