Olaf W.

Did you add the phone as a new device on the camera (button down in the start option of the wifi menu IIRC)?

Did you connect your phone's wifi to the camera's wifi?

Did you extract the firmware file? The download is most likely a zip archive.

Welcome to our forum! I've moved your topic to the General Discussion section.

Fujifilm introduced the Fuji X-T4 today, the new top of the range camera model. Following the X-T3, the new camera is improved in many aspects. There is the new built-in image stabilizer, a premiere for the X-T series, and the autofocus system has been significantly improved. . The X-T4 will be available starting in April, coming with a black and silver finish. There will be different kit lens options (XF18-55, XF16-80), or body only, of course. Fujifilm X-T4 Pictures

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You should re-download the file

Yes, it has to be extracted and placed in the root directory of the card

How did you start the update? You should press Display while powering on.

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Welcome to our forum, Jorge!

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Hi @Maaike, your question is a bit off topic in this Fuji camera forum and I moved it to the general discussion section. You could take a look at our Sony forum https://www.sonyalphaforum.com/, and ask there, too.

Did you join the camera‘s network on your smartphone?

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Glad to hear you were able to solve this. Thanks for sharing.

Did you try to format the card inside the camera? Might help.