Report "I have a Cisco 1720 router. I think I installed the wrong configuration files or I typed in a sentex error during reconfiguration and now all I can see on the screen is garbaled symbols. For example: xðxþ?xø?xø?xø???xþxøøø?øxøø??ø?øøxøø?ø??ø?x?ø?øø??xà?ø?øøøøxøø??ø??øxøøøø??xø?xø?xø?xðxþxþøø?xþ???ø??ø??ø??ø??øxà?øø?xà What can I do?"