HA: no more GUI after Supervisor Update

Hello, this afternoon I was offered a system update in Home Assistant (running on a Raspi 4) (I think it was something with Supervisor). I started the installation/update.
This evening, when I wanted to check something in my companion app, I realized that HA is not accessible via app or browser.
Unfortunately, restarting the Raspi didn’t help.

I can see HA in my router Fritzbox and it is displayed as active connection. I have installed two add-ons (EVCC and Logitech Media Server), which both have their own web interfaces on different ports, both of which I can see and access.

Now I have connected the Raspi to a monitor and the start does not run smoothly, I get to this point:

Waiting for the Home Assistant CLI to be ready…
Home Assistant
Welcome to the Home Assistant command line.
Waiting for Supervisor to startup…
System Information
IPv4 addresses for wlan0: [IP…]
IPv6 addresses for wlan0: [IP…]
IPv4 addresses for endo:

OS Version: Home Assistant OS 11.5
Home Assistant Core: 2024.2.2
Home Assistant URL: http://homeassistant.local:8123
Observer URL: http://homeassistant.local:4357

ha > [ 99.033537] CIFS: VFS: bogus file nlink value 0
[ 99.170617] CIFS: VFS: bogus file nlink value 0
[ 99.184265] CIFS: VFS: bogus file nlink value 0
[ 99.207526] CIFS: VFS: bogus file nlink value 0
[ 99.222150] CIFS: VFS: bogus file nlink value 0
[ 99.234307] CIFS: VFS: bogus file nlink value 0
[ 99.252305] CIFS: VFS: bogus file nlink value 0
[ 99.304308] CIFS: VFS: bogus file nlink value 0
[ 99.389643] CIFS: VFS: bogus file nlink value 0
[ 99.420504] CIFS: VFS: bogus file nlink value 0

Does anyone has an idea what I can do to get Home Assistant accessible again?