answered
2016-11-27 00:59:51 +0300
This should happen only if you have one of the pre-releases 2.0.5.3 to 2.0.5.5 in your device:
Sometimes an attempt to update Sailfish OS (in Settings), particularly with Jolla 1 device, may result in an error message "Update requires x MB of free space. Y bytes currently available. Free up space on your device" although there is plenty of space. In this case you should restart your device and try again (which may not always help), or use the following commands in the Terminal (requires the developer mode) after which the menu page "Sailfish OS update" should work correctly:
devel-su
ssu re 2.0.5.6
pkcon refresh
pkcon update jolla-settings-sailfishos
reboot