After OSUpdate device not booting from slot B even after marking

Advanced features include Active When placed in an HDMI slot on a television set or computer monitor, the device turns that display into a personal computer

First you need the actual fastboot, 3 Then the correct command is: fastboot --set-active=a

fastboot_ error_ failed to identify current slot First you need the actual fastboot, 3 Then the correct command is: fastboot --set-active=a

fastboot set active slot  set_active SLOT Set the active slot n oem Execute OEM if (fb->GetVar != fastboot::SUCCESS