The below VPN patch must be installed only for the following firmware version ranges:
8.7.5.15 <= x <= 8.7.5.48
8.9.3.6 <= x <= 8.9.3.20
In case you have firmware with version < 8.7.5.15 or < 8.9.3.6 the VPN feature is already enabled on the firmware
In case you have a firmware > 8.7.5.48 or > 8.9.3.20 the VPN feature patch version must be aligned with the firmware version (please check the firmware download page).