Prerequisites and Hardware Modifications

NOTE: Always disconnect your printer from the mains power supply first

Prerequisites

This firmware is configured to be used with a modified Creality Ender-3 Max 3D printer.

• Stock 32-bit silent mainboard V4.2.2 - The aftermarket V4.2.7 mainboard requires configuration changes.
  Please verify that your printer has the correct mainboard installed as described in the BLTouch installation below.
• Ender-3 V2 4.3" DWIN LCD instead of original 12864 LCD
• BLTouch Sensor installed for automatic bed levelling

Ender-3 V2 4.3" DWIN LCD

Replaced the original old-fashioned 12864 LCD display with 4.3" DWIN LCD from the Ender-3 V2
Source: https://www.amazon.de/gp/product/B091D1MPCR

• Unplug the ribbon cable on the backside of the old 12864 LCD
• Remove the two screws into the 4040 base profile on the front side of the metal holding bracket
• Attach the new LCD mounting bracket to side of the same 4040 base profile
• Connect the existing ribbon cable to the DWIN LCD and slide it to the mounting bracket

BLTouch Automatic Bed Leveling

Added an original BLTouch Bed Levelling Sensor
Installation goes easiest with a kit from Creality which includes a suitable metal bracked and the right cable

Source: https://www.amazon.de/gp/product/B08RYD1HK2

• Carefully connect the cable to the BLTouch sensor
• Attach BLTouch sensor to the gantry on the right hand side of the printing head. Use the Ender-3 Max bracket and the provided screws
• Attach the sensor cable to the wire harness using cable ties
• Open the mainboard housing on the front left side of the printer (frontmost screw on top side, all three screws on bottom side)
• Remove the bottom cover and connect the cable
• Connect the sensor cable to the 5-pin port labeled "BL_T". It can be found right next to the display ribbon cable connector near the front side of the printer
• Very Important: Make sure you have the correct "V4.2.2" mainboard. You can find the version number printed below the Creality logo near the center of the mainboard
• Check all connections to the mainboard, and especially the cable that goes to the fan on the bottom cover. It should be connected to the "K-FAN2" port on the mainboard
• Re-attach all four screws. The longest one goes into the rearmost hole on the bottom side
• You can use the bed levelling sensor after installing the new firmware

Other Modifications (optional)

• Silicone bed levelling columns instead of springs
• Aluminium bed level nuts
• Z-axis supporting rods

Next step: Building and Installing the Firmware