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LP-AM243: Unable to perform "Flash SOC Initialization Binary" step in the "Getting Started" guide

Part Number: LP-AM243
Other Parts Discussed in Thread: UNIFLASH

Hello,

I am unable to successfully perform the "Flash SOC Initialization Binary" step from the AM243x MCU+ SDK: EVM Setup guide:
https://software-dl.ti.com/mcu-plus-sdk/esd/AM243X/08_06_00_43/exports/docs/api_guide_am243x/EVM_SETUP_PAGE.html

I am able to setup the serial terminal and receive the "C" character, indicating that the board is in "UART Boot" mode.  However when I run the python script, I get the following error:

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PS C:\ti\mcu_plus_sdk_am243x_08_06_00_43\tools\boot> python uart_uniflash.py -p COM3 --cfg=sbl_prebuilt/am243x-lp/default_sbl_null.cfg
Parsing config file ...
Parsing config file ... SUCCESS. Found 2 command(s) !!!
Executing command 1 of 2 ...
Found flash writer ... sending sbl_prebuilt/am243x-lp/sbl_uart_uniflash.release.tiimage
Sent flashwriter sbl_prebuilt/am243x-lp/sbl_uart_uniflash.release.tiimage of size 294983 bytes in 27.06s.
Executing command 2 of 2 ...
Command arguments : --file=sbl_prebuilt/am243x-lp/sbl_null.release.tiimage --operation=flash --flash-offset=0x0
Sending sbl_prebuilt/am243x-lp/sbl_null.release.tiimage: 0%| | 0/258822 [00:00<?, ?bytes/s]send error: expected NAK, CRC, EOT or CAN; got b'0'
send error: expected NAK, CRC, EOT or CAN; got b'2'
send error: expected NAK, CRC, EOT or CAN; got b'0'
send error: expected NAK, CRC, EOT or CAN; got b'0'
send error: expected NAK, CRC, EOT or CAN; got b'0'
send error: expected NAK, CRC, EOT or CAN; got b'0'
send error: expected NAK, CRC, EOT or CAN; got b'0'
send error: expected NAK, CRC, EOT or CAN; got b'0'
send error: expected NAK, CRC, EOT or CAN; got b'0'
send error: expected NAK, CRC, EOT or CAN; got b'1'
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX

I have also tried this same step using the AM243x-EVM and the AM64x-EVM, and with each board, I get the same error.  Also, I have tried on two separate computers, and have received the same error message.

The marking on the AM243x IC is "XAM2434B"  Does this indicate that the device is HS FS, not GP?  And does this require an extra setup step?

Do you have any suggestions to get the flash setup?