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There was a change to security protocols that meant that you needed to update the firmware to 3.19 or later *before* they stopped supporting older firmware, if you wanted to do it via WIFI.
Fortunately, you can either update using Kobo Desktop app and update to the most recent firmware for your device (it will be a much more recent firmware than 3.19), OR you can manually update to 3.19, or any other firmware after 3.19. You cannot keep firmware 3.15.0 and use WIFI.
There are many instructions of how to install the firmware manually and each firmware is readily available through links provided on MobileRead. Just make sure you use the proper version (ie Mark4, Mark5, Mark6, etc) for your model. I've never needed manually install firmware, but it is fairly simple, and instructions are all over MobileRead about how to do it.
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