I found how to create a fake user on a new machine (or after a factory reset). This is enough to enable the WiFi and to avoid the registration screen at startup. Of course, accessing the Kobo bookstore via wifi is not possible. The original 1.9 firmware does not do automatic upgrade via WiFi so a manual upgrade is still needed (download the latest firmware at
http://download.kobobooks.com/firmwa...ade-1.9.12.zip and unzip it inside the .kobo directory)
The user is registered in the table "user" of the database .kobo/KoboReader.sqlite
The database can be manipulated with the program sqlite3
Use that trick at your own risk. I recommend that you backup the database file (or the whole kobo device)
Execute the command
sqlite3 .kobo/KoboReader.sqlite
then add a fake user with
INSERT INTO "user" VALUES('aaaaaaaa-aaaa-aaaa-aaaa-aaaaaaaaaaaa','aaaaaaaa-aaaa-aaaa-aaaa-aaaaaaaaaaaa','xxxx@xxxx.xx','xxxx@xxxx.xx','2aaaa aaaaaaaaaaaaa==');
The whole database can be dumped with
echo .dump | sqlite3 .kobo/KoboReader.sqlite