What Universal remote with the dot button and Digital Analog buttons will work on Sony DVD Recorder RDR GXD455 Sony Remote RM V310 has these 2 buttons but why doesn't it work on it?

The Sony DVD Recorder RDR-GXD455 may not be compatible with all universal remotes that have a dot button and digital/analog buttons, as compatibility often depends on the specific codes and protocols used by the devices. While the Sony Remote RM-V310 includes these buttons, it may not be transmitting the correct signals or codes required by the RDR-GXD455. To ensure compatibility, check if the universal remote you are considering supports the specific model of your DVD recorder. Additionally, consult the user manual for both the remote and the DVD recorder for any necessary setup instructions or codes.