I'm new to this 3d printing I've extended my print height but need to find out how to tell the printer about this and also I've upgraded to a v4.2.7 mainboard and now the printer won't auto home any help would be well appreciated as I'm about to loose my cool thanks .

Hi make sure your print area on the bed is clean I myself use a lint free cloth with a small amount of window cleaner not soap based as this will leave a film on the bed and cause adhesive problems if you have a very small print area for what your printing i would use a raft as this increases your adhesive area make sure to save filament temp according to what your using its normally on a sticker on the roll and save your bed temp as well then slice save to memory card and away you go good luck ,I'm pretty new to printing myself but don't be afraid to mess with settings this is how I learnt .

I've just purchased an ender extender for increasing the Z axis print height to 500 the kit includes wiring harness among other bits ,but then I realised that the built in software may not know about this extended print height ,is there a software download that can rectify this by the way printer is an ender3 pro .