I need to know how to erase an app off of the program memory. I figured out how to access the bootloader menu again easily (shorting the DTR pin to ground in addition to performing the original method works 100% of the time for me) and the only issue is finding a way to use legacy X-CTU to factory reset the MCU.
You can’t. You need to use a Debugger programmer and Code warrior for that.
I put the program on there without the debugger though. I uploaded it with legacy X-CTU.
If you want to wipe it, then you need to use a BDM programmer.