Voici la réponse de Metz-Allemagne.
J'apprécie la célérité.

Dear Mr. Christian,
thank you very much for your e-mail and your interest in our products.
In regard to having your flash unit 44 AF-4C updated on V2 we recommend to get in contact with our agent in your country DEBEUKELAER. The complete address of them you can read below Metz - always first class. - .

Best Regards