, follow these steps as outlined in the HardReset.info guide :
How to open up Developer Options in VERIFONE X990? * The device must be turned on, so hold down the Power key for a short while. * HardReset.info How to enable developer options on Android How to open Developer Options in VERIFONE X990
: Required for installing apps directly from a PC or using the Verifone SDK Stay Awake , follow these steps as outlined in the HardReset