Enable Labs on release keys Firmware

Google Glass has a hidden lab, but firmwares which with user tag cannot access it.

1. Modify build.prop. You should be granted root privilege by flashing boot.img with root firstly.

   mount -o remount /system
   vi /system/build.prop

   # begin build properties
   # autogenerated by buildinfo.sh
   ro.build.id=XRH19
   ro.build.display.id=XRH19
   ...
   ro.build.type=user  # modify to userdebug
   ...
   ro.build.tags=release-keys  ## modify to test-keys
   ...
   ro.build.description=glass_1-user 4.4.4 XRH19 3926992 release-keys # modify it
   ro.build.fingerprint=Google/glass_1/glass-1:4.4.4/XRH19/3926992:user/release-keys # modify it

   In Vi, Press I to edit files, press ESC to quit edit mode, input :wq to save the file and quit Vi.

2. After rebooting Google Glass, use following command to go into the lab.

   am start com.google.glass.settings.ui/.labs.LabsActivity