RE: JR XG11 radio
Your XG11 probably works much like the JR 11X or DSX11. When you erase a model memory that you are presently in, the ERASE functions like a reset on the older JR transmitters. If you select the same type of the model that you had (such as going from ACRO to ACRO), it resets all the functions to their defaults. Or if you select a different type of model (such as going from ACRO to HELI), it sets up a new model type using the new type model defaults.
If you want to completely erase a model memory so you can overwrite it, first you have to go to a different model memory, then erase the memory you want. For example to erase model #1, select model #2. From model #2 select to erase model #1. This is all done to prevent you from accidentally overwriting a memory.
Allan