About the rewriting of firmware via UART(ADuCM3027)

In ADuCM 3027, application notes describe that rewriting of firmware is possible via UART,
After rewriting, the program broke at boot. It ceased to recognize J-LINK.
It may be caused by not being able to rewrite page 0.

 

Can ADuCM 3027 update the program on its own?
If you have a good sample program please show it to us.

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