@rokci, what's the make and model of the modem?
I'd suggest a factory reset for this one. That'll restore the WiFi network name and password back to its factory default (the network name and password listed on the sticker underneath the battery cover, or on the base of the modem).
Depending on the device, instructions may differ. Normally, there's a tiny hole which will require a straightened paper clip to reach.
You can try searching through our Device Guides for instructions specific to your modem.
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