3945 router boots up with old IOS

[CCOCNSC21]

I am trying to upgrade IOS on 3945 router to 152-4.M6 version. even boot system command pointing to the new IOS router still boots up with old image.

also verified the new IOS and checksum is ok. any idea why

[Leo Laohoo · Accepted solution]

Post the boot variable string, the output to the command "dir" and the entire bootup process.

[CCOCNSC21]

Thanks for your reply. I have found the problem.

the model I am trying to upgrade do not support c3900-universalk9-mz.SPA.152-4.M6 rather c3900e-universalk9-mz.SPA.152-4.M6. Found the issue when testing in the lab.