F5121_34.0.A.2.301_R8A_Nordic Generic_1302-3140.ftf (edit: md5sum 6ea96ed801e6a8d3164f5280c84b17f4) worked for my unit from the recent Verkkokauppa.com sale, had to however allow debug, unknown sources and disable verification of stuff installed through USB ("Tarkista USBN:n kautta asennetut"), I think. I think I downloaded the image from https://easy-firmware.com/home/brows...-info/id/58108 (maybe a legit image? or full of malware? doesn't matter, got the TA partition with it and will overwrite with SFOS)