If you are an Android app developer, you may find yourself needing to enter fastboot mode on an Android device and are only finding instructions on the web which say to “hold the camera button and the up arrow button” while powering up.

Well, on some devices, that is impossible.

The Google Android Developer Phone 2 (also called ADP2, HTC Magic, Google Ion, and Google Sapphire) does not have a camera button, and it has a trackball rather than directional arrow buttons.

To get into fastboot mode with the ADP2, from the HTC website:

To enter fastboot mode, power up the device (or reboot it) while holding down the BACK key. Hold the BACK key down until the bootloader screen is visible and shows “FASTBOOT”. The device is now in fastboot mode and is ready to receive fastboot commands. If you want to exit fastboot mode at this point, you can hold down the keys MENU+SEND+END (on the Google I/O Device, SEND is the “Call” key and END is the “End call” key).

You should see this screen:

I will add that you may only need to hit the MENU button to power down the phone, depending on which version of the software you have.

Unfortunately, I couldn’t say with which devices this button combination works.