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Well, I tried Firefox, Brave, Safari and Chrome on MacBook. Tried Edge and Chrome on Windows PC. Tried Safari and Chrome on iPhone. Tried Edge, Safari and Firefox on Windows Tablet. Everywhere effect is the same. Issue is not on my side.Â
If this Is known bug,  then only thing left is waiting for KPN fix it?  I did not have this issue on copper with Fritz.Box. Now Having fiber and Xperia box v12… Other solution is to buy some devices by myslef and pack all Xperia stuff back to box and waiting till the end of contract?
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There will be an update, but this is released in stages, this project is already running for two years so don't get your hopes to high. Can you just reconnect your Fritzbox or did you send that one back ?Â
I still have it, but I will send It back, because I wand to have WiFi 6, which Fritz box is lacking. On the other hand, I can buy for example Xiaomi Mesh System AX6000 for 100 Eur and this I think also be a good solution. Â Just watching now for any alternatives
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Laso, I am not changing much after proper setup is done. Â so for the time being it can stay like that. And if I would need to change something I just disconnect WAN cable. This is not like a critical issue, it's just an inconvenience, Â I was more curious what is happening, why and if there is a fix for that.Â
I don't understand the, if there is an update for that, why release it in stages 
Just let people download and update :D
Solution for password issues
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1. Ensure that the WAN is connected.
2. Reset the modem and wait until it has fully started up.
3. Connect to the Wi-Fi or via a cable to the Box12 modem.
4. Open a browser (such as Chrome) and go to the following address: https://192.168.2.254 (important!)
5. You may see a message stating that the connection is not secure. You can accept this to proceed.
6. Enter the password to log in.
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After these steps, the password should be working.
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Solution for password issues
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1. Ensure that the WAN is connected.
2. Reset the modem and wait until it has fully started up.
3. Connect to the Wi-Fi or via a cable to the Box12 modem.
4. Open a browser (such as Chrome) and go to the following address: https://192.168.2.254 (important!)
5. You may see a message stating that the connection is not secure. You can accept this to proceed.
6. Enter the password to log in.
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After these steps, the password should be working.
This was tested today already with a technician on the phone. Not working.Â
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Hi @Waldi, welcome to our community! It's already mentioned but this is currently a bug with your specific sofware version. In the next update this will be fixed.
In the meantime using another browser or trying from a different device should work. If you're stil getting the error that the password is incorrect it might also be that the password is incorrect ofcourse.
More information on this is in our topic:
Let op! Lukt inloggen niet via mijnmodem.kpn? Probeer het dan via http://192.168.2.254.Â
Het kan zijn dat je browser eenmalig een beveiligingswaarschuwing heeft. Je kunt dan onder ‘Geavanceerd’ zonder problemen de risico's accepteren. Omdat je binnen jouw eigen netwerk zit, is dit veilig. Daarna word je doorgeleid naar http://mijnmodem.kpn.
Heb je ingesteld dat jouw browser standaard de cookies verwijderd? Dan zal je wel iedere keer de beveiligingswaarschuwing krijgen als je http://192.168.2.254 bezoekt.
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Blijf je de beveiligingswaarschuwing krijgen of meldingen over een fout wachtwoord? Controleer dan de volgende dingen:
- Check of je wachtwoord klopt. Sommige tekens lijken op elkaar bijvoorbeeld de letter o en het cijfer 0.
- Controleer of je de URL met http:// gebruikt, dus zonder de s.
- Verwijder oude cookies uit de browser en leeg de cache.
- Gebruik geen VPN.
- Gebruik de KPN DNS.
Lukt het dan alsnog niet? Probeer een andere browser (Chrome, Firefox, Edge, Opera etc.) of gebruik http://192.168.2.254/2.0/gui/#/login