Flashing Instructions for Ender 3 (4.2.2 Board)

Prerequisites

Complete the PlatformIO setup
Download Marlin firmware source code (latest bugfix-2.1.x branch recommended)
Copy provided Configuration.h and Configuration_adv.h files to Marlin/Marlin directory

Compilation Steps

Open the Marlin folder in VS Code
Select the correct environment:
```
default_envs = STM32F103RET6_creality
```
Click the PlatformIO build button (checkmark icon) or use command:
```
pio run
```
Find compiled firmware at: .pio/build/STM32F103RET6_creality/firmware.bin

Flashing Process

Rename the compiled firmware.bin to firmware.bin (if different)
Format a microSD card (8GB or less recommended) to FAT32
Copy firmware.bin to the empty microSD card
With printer powered off, insert the microSD card
Power on the printer
Wait for screen to initialize (about 10-20 seconds)
If successful, the firmware.bin on SD card will be renamed to FIRMWARE.CUR

Post-Flashing Configuration

1. Initialize EEPROM