Sorry, I don’t have a 3D printer (yet) so, I’m afraid you’ll have to check the Marlin instructions. Normally, after a build, the next step wiuld be either “program” to upload with a ICSP device, or “upload” to use a bootloader.
I don’t know if the Ender has a bootloader? Teaching Tech on You Tube shows how to install one, if needed, and has a recent video on using Marlin Auto. Might be worth taking a look?
The hex file should be there though? Is it not? There will be a .pio\build folder in the project folder. In there somewhere will be an elf file, a hex file and a bin file. You might have an eep as well.
yeah i figured it out now it makes a binair file once the build is succes ,now it works although i still need to edit some settings with that BLtouch but the more i look into it the more i understand ,but for now i took a break else i get square eyes hahah