Note that the 981 code is resetting only the remote itself – it has nothing to do with the receiver or any other remote. It just puts the remote back to factory defaults of IR mode 00001 and with no configuration for any other devices (TV, DVD, etc.)
First, let’s check the receiver to make sure it’s also in IR mode 00001. Use the original remote that works and Press “Menu” then navigate through “Parental, Fav’s &Setup” – “System Setup” – “Remote” – “IR/RF Setup”. Make sure the “Remote Type” is set to “IR”. If it’s RF, then that’s why the new remote does not work and it’s easy to change it. You can either set the HR2x back to IR on this screen, or, change the new remote to RF mode. If you want to change the new remote to RF mode, do this: Press and hold MUTE + SELECT on the *new* remote. When the light blinks, release he buttons and press 96 and CHANNEL UP. Then, enter the last six digits of the receiver ID (found on the sticker behind the door on the lower-right hand corner where the access card is inserted).
If the HR2x is in IR mode, then it sounds like this could be a bad remote.