Hi,
I'm trying to upgrade the backpack in my Radiomaster Ranger Micro 2.4GHz from v1.3.0 to the latest (v1.5.0) firmware, following the instructions here:
https://www.expresslrs.org/hardware/backpack/backpack-tx-setup/#transmitter-backpack-firmware-guide
When I fill in the appropriate details on the Backpack tab and click 'flash' I get a message in red:
'You must choose a regulatory domain for your device'
Unlike the Configurator tab, there is nowhere to fill in this info. What can I do?