LG Update Blocker stops the "a new software version is available" popup that webOS shows on every boot, without touching the firmware itself.

It applies up to five reversible layers and re-applies them on every boot through a Homebrew Channel startup hook:

• Block LG update servers - points snu/su/nsu.lge.com and their TLS and CDN aliases at 127.0.0.1 in /etc/hosts.
• Delete staged firmware - wipes /mnt/lg/cmn_data/swupdate. An update that was already downloaded keeps prompting even when the servers are unreachable, which is why blocking alone often is not enough.
• Lock the staging folder - bind-mounts an empty read-only directory over it so nothing can be staged again.
• Turn off auto-update settings - switches off every update related key that com.webos.settingsservice exposes on your firmware, remembering the original values.
• Stop update services at boot - optional, stops the update upstart jobs found on the TV.

Requires root and the Homebrew Channel: the app asks the Homebrew Channel to elevate its own service on first launch. "Remove protection" undoes everything.