The stepper motor cables have these little helpful labels but the fan cables and the heater and sensor cables mostly aren't labeled so make your life easier and put some labels on those, too, maybe take a photo just in case. So we're now disconnecting all cables from the mainboard. Some of them are also screwed into terminals. It fits in the same place as the old mainboard - but since the power cables are probably the hardest to re-insert into the terminals because they are quite short at least in my case, I am starting to attach them first.
Please double check the right polarity of those cables, so the red cable goes into the plus and the black into the minus terminals.
You find that information on the backside of the mainboard. Next up, I'm connecting all the remaining heater and sensor cables and finally the fans and the stepper motors. We should now be ready to close the electronics case, don't forget to connect the case fan and also any external cables like the display cable, bltouch, filament runout sensor or what you might have already. Now, you might be tempted to turn on the power already. I wouldn't do this because I don't know if and what firmware might be on this mainboard.
So I would recommend rather to get the latest firmware for your printer and copy that to the SD card to insert this before you power on so you can be sure that the right firmware for your printer will get installed, so let's get this done. For the Ender 3 Pro as an example I will go to creality. The easy way which should work in most cases is to put the printer on the side and look through the vents on the bottom to see if you can see the version.
The next thing I like to do is get the current firmware version from the printer. You will want to open the menu and go to about printer. Here you will see the current Creality build you are on and the release date.
You will just want to make a note of this; no action is required here. In this example, I have the Ender 3 Pro with the 4. Once you have the firmware bundle from Creality, you will want to unzip the folder and find the actual firmware file you need. If you have the BLTouch you will want to make sure you get the file for that. This step sounds harder than it actually is. Assuming you copied the right file to the SD card, all you need to do is put the SD card in the printer and power it on.
From there, the printer will pull the file and install it on the printer. The entire process should take less than 30 seconds. Once the printer boots into the standard interface, you can remove the SD card.
Now you will want to make sure the new firmware has been uploaded by following the steps we did to get the initial version. In the Ender 3 v2 review video, I mentioned that I updated the firmware to the latest version from Creality. Actually, I did this two times because Creality released new firmware versions during the test period.
Well, mainly because especially in the beginning, when a printer is released, it may contain some bugs and new firmware will usually address those issues and sometimes a new firmware version will also add new features. The following process not only applies to the official Creality firmware but also to custom firmware, like Marlin or Klipper or anything else.
To figure if you should update, the first thing is to check the currently installed firmware version. On the Ender 3 v2, this can be done in the printer menu, navigating to the Info screen, where you will find the current firmware version number.
Apparently, Creality released Ender 3 v2 models with a 4. Why is this important? These two mainboard versions have different stepper motor drivers and require a different firmware. To check, which mainboard version you have, there is no other way as to open up the electronics case and have a look at the mainboard itself. To do this, release the one screw on top of the electronics case and the three screws at the bottom.
If you do this for the first time, those screws might be bolted very firmly, so make sure you use the hex driver with the long end as leverage. Here on the left image you see, my printer has the 4.
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