I've had a lot of difficulty with my CR-5 Pro not reading the micro SD card. I was up and running but got the "blue screen" yesterday and re-flashed the main board using instructions I found on YouTube. But the software version showing up now is older than what was on the machine as delivered and the printer will not run a gcode file even when I can select it. Trying to re-flash using the SD card is NOT happening. The SD card that came with the machine is 8Gb "Netoc" and is formatted as FAT32. I have a 32Gb SanDisk which I've formatted also as FAT32 but neither card will re-flash the main board. Can I upload the firmware via USB like I can on an Arduino?