Modem upgrade failed

hi,

  When verifying the modem upgrade, if the network type is set to support both Cat-M and NB (AT%XSYSTEMMODE=1,1,0,0), the actual network that connects is NB, and the modem upgrade will fail. However, when the network type is set to only support NB (AT%XSYSTEMMODE=0,1,0,0), the modem upgrade is successful.

The same result occurs when using the v2.6.1\nrf\samples\cellular\http_update\modem_delta_update example for verification on the nRF9160-DK.NCS version: V2.6.1

  • Example and logs that support only NB

         modem_delta_update_nb.zip

         

  • Example and logs that support both NB and Cat-M

       modem_delta_update_nb_cat-m.zip

      

What is the reason for this? Can you give me some ideas to solve it? thank you

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