WELL if you really want to try and fix it yourself (what have you got to lose?) you can try a COMPLETE REFORMAT of the HDD. If after that the thing still goes nuts with it's updating, there is something wrong with the motherboard- probably the non-volatile RAM. Here goes... Reboot the DVR and when the message RUNNING DIAGNOSTIC TEST appears quickly press the SELECT key on your remote. You will get a diagnostic menu. Choose manual tests and then reformat hard drive. This will take several hours. When (if) the procedure completes, you will get a screen asking for the satellite setup. You must do the satellite setup which you should have noted prior to this procedure (dish type, etc.) To get this information, prior to the procedure choose System Setup from the menu and then choose MORE INFO. Finally, you will get a screen asking for an order number. This is not necessary but the same screen will tell you that you have to call DirecTV to activate (authorize) the DVR. YOU MUST CALL A CSR AT DIRECTV TO DO THIS. Tell them you have code 721's on channels you should be getting (this they understand-telling them you reformatted the hard drive will get you nowhere). Do NOT let the automated phone system try reauthorizing the receiver-it won't work after this procedure. YOU MUST HAVE A LIVE HUMAN DIRECTV REP DO IT. Trust me-I've been through this before! Good luck!!