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thanks very much but it showed up on my computer but still wont charge ive tried 15 cables"Parse Error: There was a problem parsing the package."
The above means the APK file you're trying to install is not intended for your device. For example, attempting to install the Pixel Launcher on your Coby will generate this error, as the Pixel Launcher only runs on devices running Android 7.0 or greater, while your Coby, at best, runs Android 4.0.3 or Android 4.1.
The USB issue is totally unrelated to the Parse Error. If your computer does not see the tablet even when the USB is connected, either the cable you're using is a charge-only cable - yes they do exist, and Logitech is notorious for including them in their products - or there is a problem with the USB port.