My PRO-668 Handheld Scanner is stuck on the logo screen. I've updated the scanner's CPU software (uP BootVer: RF1.1, uP App Ver: RU2.4). I've installed a new SanDisk microSD card; formatted the card with SDFormatter and RadioShack PRO-668 Programming System software. Using the RadioShack PRO-668 software, I've prepared the Memory/SD Card for use. None of this has fixed the problem. The only way to power down the scanner is to remove the batteries. Any ideas on what I should try next?