I need to upgrade the IPS 5.1 Version (with the below details) to IPS 6.0.
a)Cisco Intrusion Prevention System, Version 5.1(5)E1
b) Signature Definition:
Signature Update S288.0
Virus Update V1.2
OS Version: 2.4.26-IDS-smp-bigphys
Serial Number: JMX1010K08U
Please let me know which software release version should i download from the below one to upgrade to 6.0
It looks like you may have been trying to "upgrade" the sensor using an image file (.img). The .img files are for re-imaging the sensor from rommon (during bootup) - you would lose all of your config doing this. If you are trying to get to the latest 6.x version I would recommend upgrading using one of the following packages:
under the link "Latest Upgrades" in the "Version 6.x" section of webpage:
NOTE: You do not need to use the engine upgrade pkg (e.g. IPS-engine-E2-req-6.0-4.pkg) unless you were already running 6.0.4 and wanted to remain at 6.0.4 (6.0.4E1 -> 6.0.4E2). The engine package updates the E version (and siglevel) only, whereas the service pack packages, I listed above, will take you directly to the latest service pack version AND E2 engine version.
You can go directly to 6.0(4a) from any 5.0, 5.1, or earlier 6.0 version.
The number inside the parentheses is what we call the service pack level.
On initial release of a major.minor version the service pack level is set to "1" (there is never a "0").
As bugs are fixed that number gets higher and higher. A letter may be added if we needed to fix something in the installation script, but the content of the update has not changed.
So the first thing to determine is what major.minor version you want to run. Then find the highest service pack level for that major.minor and upgrade straight to that highest service pack level.