Web interface not working after firmware update

NVR model: RLN8-410

Hardware version: N3MB01

Config version: v3.0.0.0

Firmware version: v3.3.0.226_23031609

After updating NVR firmware, I'm no longer able to connect to the web interface using my browser. I have verified the address on the 192.168 subnet using the Reolink app.

The network is very simple. The NVR is connected to my wifi router. The device I'm connecting from is an Android phone on the same wifi network. It worked fine before the update.

Steps tried: I rebooted the NVR through the app, twice. I unplugged the NVR and plugged it back in.

Possibly relevant: initially I was able to load the login screen, but logging in failed with a message like "Network error: unable to connect". Today, about 12h later, I'm not able to load the login page either. I suspect it was just cached in my browser and I wasn't actually loading that page from the NVR unit.