Did you already got a answer?

I also got a new Ender 5 Pro and having the same problem with it. Firmware is 1.1.8 preinstalled. I would also wonder how i get the newest firmware on it in a easy way... it did'nt work with *.bin to SD-Card like @admin described...

-> Creality could work on a better and detailled Instruction-Manual... I'm not a programmer...

For the Problem with the Z-Axis, i found out a workaround... I just changed manually the steps/mm to 800. If you do that by hand you will be on it for a while. I took of the button and spin it with a drillmachine.