About 2017 iMac 27" and 2019 iMac 27" firmwares
Well as far as I could check through online research both the 2017 and 2019 models have the same hardware: same CPU socket, same GPU (ok, 580 vs 580pro, minor change) and same PSU however the 2017 model would work with the same i9 9900 CPUs available for the 2019 models and I want to know why.
Could it be just a firmware restriction in the known 'Apple way' of planned obsolescence considering the hardware is the same therefore shouldn't be any technical reason? Would the 2017 model run with the i9 9900 CPUs if its firmware were to be flashed with 2019 firmware? Could the firmware even be actually flashed just like that…?
I would really like to know more than just assumptions ?