how to go in listening mode from cellular off mode if called in app?
i created a app used SYSTEM_MODE(MANUAL); device is in cellular off mode . but now i need to change the app
device not goes in listening if i press mode button if it goes in listening mode i can change app
Are you sure you want Listening mode?
Do you want to flash via USB or OTA?
If USB, via particle flash --usb firmware.bin (=DFU Mode, preferable) or particle flash --serial firmware.bin (=Listening Mode).
That depends on your needs.
If you have physical access to the device you can always use any of above ways.
But I would add some functionality to trigger Particle.connect() to allow for OTA update if needed.