2.1r0 If you’re currently using a firmware version earlier than 2.1r0, contact the Support Team to update your ISP.
Info
3.5r7
If the current version of your ISP is older than 3.5r7, you need to first upgrade your device to firmware 3.5r7 before you can update to 4.0r1 and newer versions.
Before upgrading to the 4.2r0 version and above, you need to update your unit to the 4.1r2 version.
Info
4.6r0p2
For ISP Elite MK3, ISP Core, ISP Evo and ISR Fusion: If your current ISP Firmware version is below 4.6r0p2, the next update will need to be applied twice. The boot sequence needs to be updated before the actual update.