Force restore, also called “hard reset” of an GFive brand device is necessary when the device does not turn on, shows an error or does not respond and it is not possible to reset it from the device settings.
Keep in mind that force restoring an GFive device will erase everything on it and you need to know the passkey to be able to turn it back on even after force restoring.
Use the search engine or browse through the list to find your device among the 41 devices and get the steps to do a hard reset.