I have tried flashing + OTA (deleted old SFOS ROM first and then added a new). I had a few trial and errors, but eventually flashing went very smooth.

The OTA hanged at 82%. Running version --dup again resulted in:

REFRESHING CACHE AND DOWNLOADING PACKAGES
Waiting

After a forced restart (using button) I managed to boot again, but version --dup didn't work unless I ran all the other commands first. Then it continued and installed the last 18% (took about 15-20 minutes).

"About product" stated that 2.0.2.48 was installed and most stuff seems to be working. I didn't install sfdroid.

Found issues:
* Jolla store displays only a limited amount of apps. For instance: selecting "New Apps" will only list the first screen (16 apps) and it is not possible to scroll down.

Lessions learned:
* Delete the old ROM first and then install by adding a new ROM. My first attempt to flash CM12.1/SFOS zip files using Advanced=>Multirom => List Roms => <Sailfish ROM> =>Flash Zip resulted in strange problems and factory reset didn't work.

* I started the OTA update in handset terminal but soon realized that it would go a lot faster using ssh instead. For some reason ssh didn't work so I tried to toggle developer mode (this was after I had entered 'update mode', i.e. after I had executed 'ssu release $RELEASE') this resulted in most apps disappearing (including terminal) and also most options in settings menu (including developer options) so the phone was more or less useless. It was not possible to continue update since terminal was lost and ssh was not possible. => Reflash again! I guess this is the same problem reported in http://talk.maemo.org/showpost.php?p...8&postcount=69

Let me know if you need more information/logs.