Just to be clear, Kobo has only intended sideloaded mode to be a temporary mode to get the device working when you cannot connect to the Kobo server. Hence some things, such as this, might not work.
Having said that, try doing a firmware update check from the Device information page of the settings. This will check for and download firmware updates without needing to be signed in. It might check other things as well. Yes, you need WiFi to be on, but, it doesn't force you to sign in.
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