It may be to do with an error in the invocation, as after calling instead with a hyphen...
cefn@cefn-dell-bionic:~$ adb reboot-bootloader
* daemon not running. starting it now on port 5037 *
* daemon started successfully *
error: no devices/emulators found
It may be to do with an error in the invocation, as after calling instead with a hyphen...
cefn@cefn- dell-bionic: ~$ adb reboot-bootloader
* daemon not running. starting it now on port 5037 *
* daemon started successfully *
error: no devices/emulators found