QuickBooks POS error 1330 usually indicates that there is an invalid data signature. This error is displayed for a variety of reasons. This error code is displayed on the screen with the error message "Invalid digital signature". It is usually considered  an unrecoverable error and it is recommended that you fix it immediately. Please read this post carefully for more information on POS error 1330 and its fixes.

Check out the Methods step-by-step to fix the QuickBooks Point of Sale Error 1330.