It seems that Fuji is having a bit of an issue with firmware updates through the Camera Remote app on either a smartphone or tablet, according to an announcement put out by the company. It doesn’t seem to affect every camera, although, with some, the camera freezes after installing the firmware update from the app. It’s expected to be updated and fixed in the next few days, but for now, if you own the Fuji X-T30, X-T30 II, X-S10, X-T3, X-T4 or X-T5, you’ll want to avoid updating the firmware through the app for now.
This doesn’t mean you can’t update your firmware, however. Fujifilm has made the firmware updates available for download so that you can still update from your SD card. Fujifilm says that the freezing issue does not occur when using the SD card.