TM4C1294NCPDT: Erase flash memory whitout JTAG

Part Number:TM4C1294NCPDT

Hi evebody

I developed a custom board where I have 2 microcontrollers TM4C1294NCPDT that communicate via port SSI0. But only one of them is connected to a JTAG interface.

I try to write the firmware on the other microcontroller via SSI, but for this to work, the microcontroller flash memory needs to be erased.

I think flash memory is erased from the factory, but that does not happen. The microcontroller has never been used.

I want to know if it is possible to erase flash memory via a circuit or SSI port.
Or if is possible force a firmware update via SSI in the microcontroller without the jtag.