After struggling to boot and mount my CM3+ on my Ubuntu system, I tried on booting it on my Windows system. Windows worked, Ubuntu did not.. Looking at the help section I realized I was using an old version of rpiboot on my Ubuntu system.. Might be worth having version number of the software displayed in the help section and also the first line you see when you try to boot a CM module.
After struggling to boot and mount my CM3+ on my Ubuntu system, I tried on booting it on my Windows system. Windows worked, Ubuntu did not.. Looking at the help section I realized I was using an old version of rpiboot on my Ubuntu system.. Might be worth having version number of the software displayed in the help section and also the first line you see when you try to boot a CM module.