It's always advisable to check the MD5 checksum after you downloaded the new IOS image and again after you uploaded the new image to the Cisco device. Otherwise, your routers may not even able to boot up with corrupted images. There are free MD5 checksum program available on the Internet. One such program is the MD5 Checker. And it's also probably good idea to store the MD5 value alongside with the image.
Once you have uploaded the new image and before you reload the router, run this command:
#verify /md5 ‹ ios image location ›
example: verify /md5 flash:c1841-adventerprisek9-mz.124-25e.bin
Compare the output value with the MD5 sum that you noted earlier.
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