Is there a universal way to enter recovery mode on an Android device with only one turn on/off button? I have a tablet (Navon Raptor 7) like this and I can't figure it out. An other problem is that although it can boot and get to the launcher, basically I can't start any application or get to the settings (it says 'xy application stopped' etc.) so I can't even activate debug mode and use adb to achieve this. That's why I want to do a hard reset from recovery...
You can use the following command from an adb prompt to enter into your devices recovery mode without using a physical button during restart.
1) Start adb prompt on your PC / MAC / Linux
2) Make sure adb is running
2) Make sure the device is present when you run:
3) Now run
adb reboot bootloader and your device will restart into recovery mode