Vr2Io

Does both in same network / subnet ? Any blocking between them ? Could you try on other browser or PC ?

And completed now.

As mention, the access PC internet service, not Unriad self internet service. Once resume the access PC internet service, then update on-going as normal.

I simulate if the access PC haven't Internet access, it stay in same screen outlook as your screen capture. So pls ensure the access PC Internet service is normal.

Update usually complete within 30min. If nothing happening or on-going then you should close it and restart. Post screen capture would better know whats going on.

Recent month have two internet issue, those cause little bit long outage time. My ISP modem problem : It's IP change and all internet access stop, I never got this type strange problem , my router can get IP from ISP, but all internet access fail, many hrs troubleshoot still can't fix the problem. Finally I request ISP onsite maintenance on next two day ....... but before they reach, I observe there are a reset button on modem, so I try to pin it and all problem solve, WTF this cause my internet service down for 24hrs+ My router WAN DNS setting problem, I use router self update dynamic DNS, it suddenly not work , also troubleshoot in some hrs and finally identify a setting which control router WAN use which DNS have problem, that public DNS won't resolve all request, after change to other public DNS then problem solve. This setting haven't change in longtime, so I already completely forget that. ( My LAN / Internet access haven't any problem because router WAN DNS and LAN DNS are different )

Also check the PC which access Unraid to perform update, its clock must up-to-date and internet aaccessable.

Look like problem relate ISP's IP change, due to not sure how you remote access your network and overcome this, but most likely reboot won't solve the problem. BTW, push power button usually perform normal shutdown, but don't hold the button too long, otherwise it will power-off immediately instead soft shutdown, we don't want corrupt file system.

Congratulations, network bridge somehow trouble.

Both correct.

Both are same, when Thread device connect thr WiFi, that is Matter over WiFi, if connect thr zigbee, that is Matter over Zigbee.

That's why I suspect problem here, your Thread device were connect thr ZBT1's WiFi network and your phone in ISP's WiFi network. During commissioning, Phone and Thread device need in same network, so you may try commissioning (pairing Thread device) by HA instead Phone. Your HA have connect multiple network, one is usual home network and one is ZBT1 network. But me just one, all IPv4 / Thread also in one. I recommend in this way, at least this look more simple and work.

The AP like a network Switch, you no need to setup a Switch to support IPv4 / IPv6 /Thread ..... both just need understand Ethernet frame for fundamental function. Pls note English is not my nature language, hope you understand what I say.

As mention before, I use existing WiFi AP, that AP no need to setup support IPv6 or Thread. The thread device just connect to it, and actually comunicate to Unraid in Thread （IPv6) with Unraid (Matter server).

But you use BT1 to form the Thread WiFi network ？