This problem can be related to the Amaze 4G storing unused files in the background, and causing low memory. These unused files cannot be removed by clearing the cache normally.
HTC has developed an Amaze Memory Clear application to remove these files. It will not remove anything you have stored on the device.
After you update the device to Android 4.0, the Amaze will no longer store these files in your device memory. However, you may still have some left from before the update, so HTC recommends running the Amaze Memory Clear app once after the update.
To fix the device not updating, follow these steps:
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