BrowserMod gone crazy: how to fix a new instance!?

My browser mod with auto register has gone mad. I had over 1.249 devices with 10k+ entities. As I couldn’t find a bulk delete I removed the instance.
But with setting a new one up I get this:

Logger: homeassistant.config_entries
Source: config_entries.py:637
First occurred: 17:23:26 (2 occurrences)
Last logged: 17:24:38

Error setting up entry Browser Mod for browser_mod
Traceback (most recent call last):
  File "/usr/src/homeassistant/homeassistant/config_entries.py", line 637, in __async_setup_with_context
    result = await component.async_setup_entry(hass, self)
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/config/custom_components/browser_mod/__init__.py", line 43, in async_setup_entry
    await async_setup_view(hass)
  File "/config/custom_components/browser_mod/mod_view.py", line 43, in async_setup_view
    async_register_built_in_panel(
    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^
        hass=hass,
        ^^^^^^^^^^
    ...<10 lines>...
        },
        ^^
    )
    ^
  File "/usr/src/homeassistant/homeassistant/components/frontend/__init__.py", line 317, in async_register_built_in_panel
    raise ValueError(f"Overwriting panel {panel.frontend_url_path}")
ValueError: Overwriting panel browser-mod

I really have no clue.

Can you restore from a backup that was prior to changes you made?