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Cisco 4K 16.06 Everest IOS upgrade, triggers firmware version 16.7

Our customer has the ISR4321/K9 router . When IOS was upgraded from existing version 15.5.2 to 16.06 Everest, it trigger firmware version upgrade as well. This behaviours was not expected during IOS upgrade activity. Can anyone please advise why? You can see the result below.

 

 

Before IOS upgrade

Slot      CPLD Version        Firmware Version                       

--------- ------------------- ---------------------------------------

0         15030325            15.4(3r)S5                         

R0        15030325            15.4(3r)S5                         

F0        15030325            15.4(3r)S5            

 

After 16.06 Everest, it triggers firmware version 16.7

Slot      CPLD Version        Firmware Version                       

--------- ------------------- ---------------------------------------

0         15030325            16.7(3r)                           

R0        15030325            16.7(3r)                           

F0        15030325            16.7(3r)                            

 

 

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