Unfortunately, the device I received from digitec was not compatible with my iPhone X. I was able to have it replaced free of charge by SanDisk support. However, I was able to have it replaced free of charge by SanDisk support (device sent to the Czech Republic by UPS, compatible device received about a week later). Everything went great with SanDisk support. According to SanDisk, it is a "matter of luck" whether you get a compatible device. As in my case, it may need to be replaced. A firmware update is recommended first, but unfortunately this didn't help me either, so it had to be replaced.