Just a really general comment. Air freight is rough on screws. The micro vibrations of planes back screws out. Regardless of the product I often just go check screws to make sure they are tight.
The failures seem to be a part of the process. I have forgotten whom said there are two classes of printers, the hobby class like the creality that need tinkering and the others that cost more but just work, Prusa for example.
It can be very frustrating. I am fighting with an Artillery.
my experience is these are all hobby printer. Nothing but pain to fix and learn as you go.
so if you have some computer, mechanical and electrical skills you are good to go or else buy expensive industrial printer.
Prusa is between industrials and the printers that are a hobby of fiddling with it rather than using it. I built mine and it was flawless once done a friend ordered his and it was perfect from first print. no messing about. The three other printers have many hours for fiddling and make worse prints. The artillery after all the parts and fiddling (3 months of fiddling) cost more than an assembled Prusa and can’t print the sunshine engine benchmark. The prusa does at 0.2 no issues it is perfect the first time.
Yes I did change my motherboard. My original did not burn out but I did not feel comfortable about the reputation of them burning out. I went with the BTT SKR CR6 board. It came with Creality firmaware which worked but I took another step and installed Community Firmware available on GitHub.
I had many loose screws ( heat bed, heat block, y stepper motor, etc…) and some part failures (power switch, filament tube end melted (i print PETG at 240C) and the heat sensor in the heat block).
After all these issues fixed my CR6 prints really really well (knock on wood).
For the CR-6 3DPC sells 2 replacement motherboards
Creality v4.5.2 for $120 ( the version that has a burning reputation…)
BTT SKR CR6 1.0 for $80 (works with Creality or the open source Community firmware version,
The SKR CR6 works with the original CR6 screen or you can use larger BTT screens.
With the SKR CR6 board the Z endstop LED does not come on but the detection works fine.
Note: Creality has v4.5.3 that apparently the burning issue is fixed. They may also have another board but I did not bother to check as the SKR CR6 board works well.