If you have CPP4 cameras with 6.11 firmware (FW) version and you need to upgrade them to the latest version, normally you have to upgrade to an intermediate firmware version first.
But where you can find this firmware ?
You need to use the CPP file (global file not encrypted) and update the camera as many time as possible to go up to 6.50 (where the FW are encrypted).
The CPP file contains all the intermediate FW needed to update an old FW.
Then you can switch to the CPPS global file and update until the 7.10 version for CPP4.
These files can be found here, on the Download Area.