hello, we have repaired the databse for you, pls try to re-add the device via searching Brand:Vizio Model:M512A-H6-1 , Per the channel, pls see below steps:
1. Create the device as an Activity, this Activity can be a single device or together with other devices
2. In Activity mode, edit the selected Activity item by Edit----Assign keys for X1-Remote or Keys favorites (one is assigned to the physical key, and the other is only displayed on the screen)
3. According to the prompt, choose to add Macro keys. If it is channel 154, you can set a macro named 154, which contains four commands: 1, 5, and 4, . (FYI, if you need a reference video of how to set channel, pls email to sofabaton@outlook.com directly, tks)