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Trying to get update from 57 to 75. This device reboots all by itself, over and over. Sometimes it will stay on for a while. Have tried factory reset many times and check for updates many times. Says no update available or software is up to date and sometimes it will say error checking for update. Also why is it that I can hold down power button with no battery installed hooked up to pc usb cable and it will go to screen saying downloading software update, but does not install. This is the only way I have at least gotten it to say that. Nothing else works. have tried this with sim card installed and not installed. Hooked up to pc or not hooked up to pc. I just want this device to update and stop power cycling all the time.