illegal software format while trying to upgrade fw in sg200-26
I own 2 cisco switches small business switches.
they are both SG200-26 26-port gigabit smart switches. One has fw ver. 184.108.40.206 , while the other has version 220.127.116.11.
I am now trying to upgrade their firmware to the latest version 18.104.22.168, found here http://software.cisco.com/download/release.html?mdfid=283771818&flowid=24301&softwareid=282463182&release=22.214.171.124&relind=AVAILABLE&rellifecycle=&reltype=latest
I go the http management interface from google chrome and select "upgrade firmware from http". I choose the .ros file and try to carry out the update.
Unfortunately, the system informs me that the copy has failed and that the software is of "illegal format".
I have double checked that the file is the correct one. what could be wrong? Do I need to update the bootloader first? is there a guide for that?
This worked for me as well. I was trying to go from version 1.3.something to the latest 1.4.something and it would give me this error. I upgraded to the latest 126.96.36.199 firmware AND boot code first. Then upgraded to the 188.8.131.52 build afterwards.
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