Flashing Bootloader and firmware to Creality Ender 2

gistfile1.txt

Built AVRDude with initial support from the repository, https://github.com/maxxproff/avrdude-ch341.git
Only built with ch341a support and not bitbang using SPI on my atmega1842p clocked at 16Mhz, the bitbang support
requires linking to a library not compatible with Linux Aarch64, and I don't need it.

Grabbed optiboot firmware from the Sanguino project, https://github.com/Lauszus/Sanguino/blob/master/bootloaders/optiboot/optiboot_atmega1284p.hex
./avrdude -p atmega1284p -c ch341a -C avrdude.conf -e -u -U lock:w:0x3f:m -U efuse:w:0xFD:m -U hfuse:w:0xDE:m -U lfuse:w:0xFF:m
./avrdude -p atmega1284p -c ch341a -C avrdude.conf -e -u -U flash:w:optiboot_atmega1284p.hex -U lock:w:0x0f:m

Then built TH3D_Unified2_Creality_Melzi with Microsoft Visual Code for Linux Aarch64 and optiplex
and flashed the firmware over usbserial with the following command.
./avrdude -p atmega1284p -c arduino -C avrdude.conf -P /dev/ttyUSB0 -b 115200 -Uflash:w:firmware.hex