Sorry for falling off on this. I switched back to the Pi because I couldn’t get this to work. I don’t have another upboard to try it on, but I’ve used 4 or 5 different USB sticks and have tried downloading new images and using those, all without success.
Here’s an overview of the behavior I’m experiencing in case it is helpful to the Resin team or anybody that is dealing with something similar in the future. I’m recounting from memory so it’ll be rather high level.
I successfully flashed a dev image onto the Upboard and it was working as expected. Then, when I went to place a prod image onto the board, I went through the same process as before. However, after selecting the boot drive and booting up the device, I was met with an error that indicated an overlap in the partitions. Now, when I boot the device without selecting the boot drive, I’m brought driectly to the grub cli and when I attempt to flash a new image (either dev or prod) onto the UPboard, I can select the boot drive and then, after selecting the drive for it to boot from and rebooting the device, I’m shown the same partition overlap error.
If more details would be helpful I’m happy to grab the device and send over error messages etc.