Upon building a 6.2.0 b2qt image for Raspberry Pi the documentation says that the image should be located under tmp/deploy/images/raspberrypi4/b2qt-embedded-qt6-image-raspberrypi4.img. This is a dead link, pointing to b2qt-embedded-qt6-image-raspberrypi4-

.rootfs.wic. There is no .rootfs.wic file, but there is a .rootfs.wic.xz and a .rootfs.wic.bz2.

The .wic.xz file does work if you unxz the file and just flash the .wic file like an image. This manual step just isn't mentioned, or is likely not desired in https://doc.qt.io/QtForDeviceCreation/b2qt-how-to-create-b2qt-image.html