About your devices, we have added for you.
Please remove it and add it again to get the latest database.
1) Search Brand:Panasonic Model:TH-49JX900Z
Step 1: Remove & Add it again, Enter your Brand
Step 2: Click"Popular models"
Step 3: You can find more buttons by using "Reassign the Key" Function.
Kindly noted:
* Please do not cover the place where the signal is emitted (IR device)
* Keep line-of-sight (IR Devices)
I took a video for you, hope it can help you better know U1.
https://www.youtube.com/watch?v=6tRiVf28G74