Hi @Vulcan2023
Welcome to the forum I’m glad you found us.
I am going to post a couple of threads here that you may find useful. You do have a project there to get working. Just take it step by step.
First be able to define what does not work over what does work. Do you have heat control of the nozzle and bed? Will it Home? will it home only X and Y and not Z? Does the BLtouch function as it should?
I know these do seem like a lot of questions but one step at a time.
Here is our build video on the CR20 so you can refer to all the correct lingo …
Here is a thread from someone in a similar situation as yours
Finally here is a website that can assist with building the firmware, They do charge a little $$ for it but it can save HOURS on the troubleshooting side.
I am darned if I can find the link for it right now. Maybe one of the other members can remember the website that can build Marlin firmware for you?