I believe the xPlusz command you entered must have been #47,1. This activates noscramble at bootup (#43,1 activates telnet). You either need to reboot your DTivo to activate noscramble or enter #54,1 to activate the current noscramble module immediately. If your videos still don't play then try turning noscramble off to see if they'll play (#54,0). If they play with noscramble off then they were recorded in scrambled mode and must be viewed with noscramble off.
Please don't PM me or any other members looking for personal assistance. You'll do better by posting (after you've exhausted the search feature, of course) and taking advantage of the collective expertise of the membership instead of a single individual that may or may not be able to help you. Thank you and enjoy your stay at DDB!