I see your claim pycage. Would something like this solve the issue:

- Download the update with Jolla Store
- Do the update with zypper
- Re-tag the device as 1.0.2.5 (ssu re 1.0.2.5 ; ssu up ; ssu ur)
- Install the update with Jolla Store

Basically I gained the ability to do all that through the conventional means: I have a Wifi connection now, so I don't need the console anymore... except that the 1.0.3.8 install crashes because of some packaging issue.

So I tried this, and after using zypper to first upgrade the package, the install went well (or so it seems). Am I really in 1.0.3.8 now ?