You can check your LG devices latest firmware released date with this application.
LG doesn't provide additional informations like firmware version on server,
so you can just check the date when the latest firmware was released.
Check All LG Devices' information or filter with Device Code like LM-V409N
/* Developer */
Yongmin, Yoo : LR
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Ažurirano dana
23. jan 2019.