@ashrafz
Perhaps there is no JCV issued by Garmin for the nuvi 4x/5x with MENA CN 2025.10? If your device is a local product with MENA factory-installed and an update entitlement to the map (either OneOff or Lifetime Map) then all ancillary files should also have been offered.
GarminExpress wouldn't have installed ANY such associated files if it's not an original MENA marketed device, and that includes JCV, i.e. if you have purchased the map for a European or American sourced device .... however then the default naming would not be "gmapprom" as you wrote which is reserved for the factory-installed map version.
It may be best to contract your local Garmin office with your concerns if your nuvi 42 is entitled to the 2015.10 MENA update:
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