Using iPrint client (v540) and HP printers.
We installed printers at image time using a command line.

Printers were giving problems (spooler crashing), so we wanted to change to UPD.
So, we modified the drivers on the IPP servers to be UPD.

I then created a policy to push the printer out again, and update the driver.
The policy IS applied successfully, but when I check the printer it still says it is using the old driver, not the UPD.

I am not specifying anything in the policy other than:
- The IPP printer path
- The checkbox for "Update iPrint printer driver while installing the printer"

The policy is enforced and is being applied successfully (checked form device and ZCC).
Any advice as to why it is not using the new driver?