I've send a email to Fuji about the leaked firmware and just recieven a answer from Fuji Europe by email
Hello Mr. van der Meulen,
Version 4 is not officially available, any kind of „leaked“ firmware might cause a problem at your camera which is not covered by the warranty.
We cannot guaranty that the official Firmware can be used again, once a Version 4 is already installed.
We recommend to not install any kind of unofficial firmware.
Kind regards/ Mit freundlichen Grüßen
i.A. Torben Hondong
Ihr FUJIFILM Service Team
phone: 00800 3854 3854
fax: +49 2821 7115 111
email: SERVICE@FUJIFILM-DIGITAL.COM
FUJIFILM Electronic Imaging Europe GmbH
Fujistraße 1
47533 Kleve, Deutschland
http://www.fujifilm.eu
Registergericht: AG Kleve, HRB 1684
Geschäftsführer: Christopher Brawley, Adrian Clarke, Toshihisa Iida, Shigekazu Matsuki
And,
the update is expected to end next week
Kind regards/ Mit freundlichen Grüßen
Ihr Fujifilm Serviceteam
i.A. Rita Behrens
FUJIFILM Electronic Imaging Europe GmbH
Fujistraße 1
47533 Kleve
Phone: 0080038543854
Fax: 02821-7115111
e-mail: service@fujifilm-digital.com
www.fujifilm-digital.de
www.fujifilm-shop.de
Facebook : https://www.facebook.com/FujifilmCamerasDe
Registergericht: Geschäftsführer:
AG Kleve HRB 1684 Christopher Brawley, Adrian Clarke, Toshihisa Iida, Shigekazu Matsuki
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-----Ursprüngliche Nachricht-----
Von: Roland van der Meulen [mailto:rjmvandermeulen@icloud.com]
Gesendet: Freitag, 19. Juni 2015 10:29
An: X_service_digi
Betreff: Firmware 4.0
The 4.0 firmware for the X-T1 has been leaked and is available on several forums. When is the official release?