[GrandNeko40]

on many linux distributions, you can edit the “wpa_supplicant.conf” file to preconfigure a wireless network. i’m not super familiar with kobo modification, so i’m not sure whether this is applicable. try searching the kobo forum for the string “supplicant”.

the other thing you can try is just “duplicating” your grandfather’s home network, in your own home. get into your router/AP’s config page, create a new network (or temporarily rename your current one) named exactly what his is named, and set the password to what his password is. then, join his kobo to your local version of his network. when it arrives in his home and wifi on the kobo is enabled, it should connect just fine.

ETA: make sure your dummy setup net is configured on the same frequency band as the eventual destination network. also, my apologies -- my eyes apparently totally glossed over your last paragraph where you said you're already aware of the wlan duplication trick.