I am attempting to upgrade the firmware on my Zubax GNSS 2.2 running FW 4.0 to the latest version.
Having read through a variety of documentation (which, by the way, I feel is a bit fragmented), I progressed all the way up to the point where I attempt to put the bootloader into “download” mode. It simply gives the -20002 error, which signifies exhaustion of attempts. However, this error is returned after merely a couple seconds, whereas the YMODEM is supposed to wait one minute. I suspect there may be something wrong with my command sequence or setup.
Potentially important is my environment - I am running sz and minicom from the bistromathic VirtualBox image provided by Zubax - when changing modes (i.e. entering the bootloader from CLI) the device disconnects from the VM and I must reattach it through VirtualBox.
I have attached images of the command sequence and error below.