DA16200 MROM how to load image 1

I am attempting to load RTOS image #1 via the MROM.

loady 1e2000

do the ymodem stuff.  seems to work.

Changed boot index to 1 (from RTOS #0).  Reboot.

MROM indicates an error and drops to the command prompt:

Image Header, CRC Failed (b84c8891 - cfec6341) [0003d813]!!

This is ymodem at 234000 baud on the EVK board, so I'm not sure how there could possibly have been a bit error during the download.  I have retried multiple times.  No luck.

Can you change the boot index back to 0 from MROM?  I do not see any documentation on how to do this.

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