I bought an Instinct 3 – 50 mm, Solar, and it comes with firmware 5.21 pre-installed. When I try to install the new available firmware through Garmin Express on my Macintosh MacBook Pro, I get a message warning me that the software cannot be installed because it is too large for the device's internal memory. I have tried to resolve the issue, but it's impossible and very frustrating that this happens with a new device. Any idea how to fix this?