Keep holding the button until a appears with the text "Upgrade Software Do Not Turn Off".
If you are downloading this file to fix software issues or "unbrick" the TV, follow these official Kogan Help Desk instructions: Download 3507861 1920x1080 Kogan KALED553DSMTZA part2 rar
Android 4.2 (Dual-core 1.2G CPU, Mali400 Quad-core GPU). Keep holding the button until a appears with
The file appears to be a fragmented archive containing the official firmware or service software for the Kogan 55" Agora Smart 3D LED TV (KALED553DSMTZA) . This specific model is a Full HD (1920x1080) 3D Smart TV running on an Android 4.2 dual-core platform. Device Specifications Model Name: 55" Agora Smart 3D LED TV (Full HD). Product Code: KALED553DSMTZA . Native Resolution: 1920 x 1080 (Full HD). This specific model is a Full HD (1920x1080)
Press and hold the button on the remote (or the TV's physical power button, depending on the revision) and turn the master power switch back on.