This browser can't talk to USB radios. Installing needs Chrome or Edge on a computer (Windows, macOS, Linux or ChromeOS).
You can still download the firmware files and flash them with esptool.
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What do you want to do?
Plug in and install
Fresh install erases everything on the radio, including contacts, messages and settings. Go back and pick an update to keep them.
Not connected.
Technical log
Download the firmware
Prefer the command line, or flashing from Firefox / Safari? Every file, its checksum and the exact esptool command.