TM4C123GH6PM: How to reformat and delete program flashed to TM4C

Hi Seong,

  If you just erase flash you can do it in CCS. See below. 

But if you want to fully restore the device to its factory settings then you need to do a unlock. t This is a mass-erase. The difference between unlock/mass-erase and erase is that mass-erase will also erase the on-chip EEprom and all non-volatile registers. See below if you are using a LaunchPad or ICDI as the debug probe. You can use LM flash programmer to unlock the device. 

If you are using a debug probe such as XDS100 or XDS200 or XDS110 you can use dbgjtag.exe command to unlock. See section 5.3.2 in this app note for details. 

https://www.ti.com/lit/pdf/spma075