I have a cisco 2821 router configured as a CME version 7.1.
Now I want to upgrade the IOS to version 15 to get a CME version 8.6 but I faced a problem that the flash of the 2821 is 64MB and the IOS version 15 required flash 128MB.
I tried to replace this flash with another 128MB installed on Cisco 2811 router but when I installed the 128MB flash on the 2821 CME the 2821 didn't boot from it.
Please can you support me in this issue.
Please I need your advice:-
If I have router with 64MB flash and another with 128MB so can I swap the flash between the two routers??
Router 64MB upgrade to 128MB
Router 128MB downgrade to 64MB
It is possibe??????
I doubt there would be any issue using a Flash from one in the other. I have done that a thousand of times. Anyway, make sure you format that flash and copy all IOS and CME files (templates, ephone firmware,...) before using it. I have recently migrated from CME 4.1 to CUCME 8.5 without an isue. Just remember to look for changes in IOS commands, phone upgrade process,...etc (for example, new CUCME ios has a great part of the CME files embeded and also features new VoIP security features enabled by default).