I have had the same issues, And I have exhausted myself looking at the so called professionals that screen videos of then Leveling the bed on a Creality CR-10s Pro, for me none of those videos worked for me. I started from auto home then loosening the x axis couplings measure the hight of each x acts screws tighten them when you have them both at the same length, the auto home again then check them both again, then carrie on the normal way with the shimes measure again adjust if its out, and use a small level to see which one you need to adjust, this can take a while and you will need patience, I hope this works, Good luck

@admin have you decided on a large scale printer, with crowd funding ? if you do I will be interested.

This is just my opinion and I have no intentions to cause or bear malice to what i'm going to write.

Would it not be prudent to, on your sales site and one flicks through All the sales pictures on any of the Creality sales or information sites place a link Next to each model of ALL the Creality 3D Printers that will open up a section with the information of that particular 3D Printer, With All Firmware down loads, and also offer anyone to purchased SD cards fully loaded with the compatible Firmware, so those that are unable to download firmware do not have to spend time trying to get the Correct firmware for their particular 3D Printer.
As in my case I have downloaded a virus when i wanted to upgrade my firmware, and there are benefits of more Revenue for Creality If it is packaged and presented as a good Back up, with the added information of Rogue hackers and viruses

Can anyone help me or has had a problem updating screen and mother board up grades? I have 2 CR10S Pro's and im unable to use any of them after upgrades on both of them.
I have Tryed to up or downgrade them both, many times but they both just do not seem to want to install the information from the sd card or from a usb, I have purchased new sd cards both formatted correctly. ive used the firmware from most of the companies that state they have the "upgrades for the cr10s Pro" but none of them work.
I have been at this for over 4 Months and its really getting me down, Any info would no matter what would be help full
even i i have to stand on my head a whistle, as long as i can get both of my printers working.