: After extracting the .rar file, the resulting firmware is usually named allupgrade_msd338_4G_ref58.bin . On some models, you must rename the ref58 part to sos (e.g., allupgrade_msd338_4G_sos.bin ) for the TV to "catch" the update.

: This specific firmware is for 1920x1080 (Full HD) screens.

Kazmi Elecom for free firmware downloads often shared on social media.

Remont-AUD for technical dumps used with programmers like the RT809.