Description of problem: When ARMv7 is selected, there is no information about supported hardware. There are plenty of arm hardware each with its specific boot process that need to be considered during the installation. See fedora arm installer [1] and the supported boards. Version-Release number of selected component (if applicable): mediawriter-4.0.95-1.fc26.x86_64 [1] https://fedoraproject.org/wiki/Architectures/ARM/F26/Installation#Fedora_Arm_Installer
I've written the arm image and tried to boot it on my Banana Pi without success. It probably isn't supported.
FMW supports only the platforms where vanilla raw images are supported. These are, as far as I know, only Raspberry Pi 2 and 3. I will add a dropdown where the user will be able to choose which image should be written, however so far only with Raspberry Pis (and maybe other boards that support vanillla Fedora images).
mediawriter-4.1.0-1.fc26 has been submitted as an update to Fedora 26. https://bodhi.fedoraproject.org/updates/FEDORA-2017-729cc5d719
mediawriter-4.1.0-1.fc26 has been pushed to the Fedora 26 testing repository. If problems still persist, please make note of it in this bug report. See https://fedoraproject.org/wiki/QA:Updates_Testing for instructions on how to install test updates. You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2017-729cc5d719
mediawriter-4.1.0-1.fc26 has been pushed to the Fedora 26 stable repository. If problems still persist, please make note of it in this bug report.