What is the method you mention? A top google result seems to be [1], which says
> All release versions of webOS 9 ("webOS 24") are patched. This means 2024 models and older TVs that have been upgraded to webOS 9 will require another exploit such as faultmanager-autoroot [2].
and [2] says
> As of 2025-08-24, the latest firmware for essentially all LG models running webOS 5, 6, 7, and 9 is patched.