Jolla has a file with mms apn configuration per operator. https://git.sailfishos.org/mer-core/...eproviders.xml Older versions of SailfishOS have older version of this file. So when you did factory reset you got old mms apn configuration. It doesn't matter that this configuration changed during next SailfishOS versions. When you use "Reset do default" in newer version of SailfishOS it will get mms apn conf from the newer version of this file which is included in OS.