Setup has only minimal adaption if one at all. No, chum or 3rd party repos. Plain jolla repos only. One app downloaded and installed manually from chum (as rpm) only. Android layer has 6 apps installed only via apk manually. Some config tweaks via manual patches but nothing wild (one line adaption on qml files like Clock app missing remorse timer when deleting - #8 by leon).
Or rephrased differently: If an update (SFOS) is available, I do not need to do some preparation because of some adaption. I go straight to update process and after reboot the phone is up to date. This works since a couple of years this way. Except this issue here …