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Hi @bronatio , thanks for your guide! Great job! My configuration is: VTH Model: Dahua VTH5221D-S2 Firmware: 4.400.0000000.7.R VTO Model: Dahua VTO3221E Firmware: V4.400.0000000.3.R This work very well but ringtone file must be *.pcm or .wav Have anyone idea how can I change VTO backlight...