There seems to be a lot of frustration with this 3D printer. And one of those frustration stems from how confusing the firmware update process is. The documentation is lacking in terms of some of the details.
To keep things simple, here are the important bits:
Updating the firmware of this 3D printer involves two separate steps. The first one is to update the firmware of the hardware. The second one is to update the firmware of the screen.
This after-sale training video does an okay job at demonstrating the overall process: https://www.youtube.com/watch?v=qZHdCAixygg
But some additional things that you need to keep in mind are:
The SD card is between 16 GB or smaller.
It has one partition of type W95 FAT32 (LBA). You can use cfdisk to ensure this.
The partiion is formatted as FAT32 (with an allocation size of 4096 KB, sector size of 512 bytes).
You can do this with
sudo mkdosfs -s 8 /dev/sda1
It is worth noting that it is possible to use an SD card of larger capacity. But all you have to do is make sure the partition is of a smaller size. In my attempt, I was able to use a 2 GB partition (type: W95 FAT32) on a 32 GB micro SD card with the above configuration to flash the screen firmware.
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