TM4C123GH6PM: ROM BOOTLOADER

Hi, Everyone

I have a question about TM4C123x UART boot using BOOTCFG register.

I use TM4C123x EVM and I write this program.

//Access to FMA
*((volatile unsigned long *)(0x400FD000)) = 0x75100000;

//Access to FMD
*((volatile unsigned long *)(0x400FD004)) = 0xFFFF32FE;

//Access to FMC
*((volatile unsigned long *)(0x400FD008)) = 0xA4420008;

while (HWREG(FLASH_FMC_R) & FLASH_FMC_COMT) { } // Wait until the write has completed.

I set PB4 is high when reset(POR).

and after terminate, I want to update using LMFLASHPROGRAMMER.
but I got error.

Can you tell me any advice ?

Best Regards
Hiroyasu