I lost my TV remote, so I built one with an Arduino

So, yesterday my primary TV suddenly stopped working, it's a Sony Bravia. What happened?… well god knows… and believe me, sony has no clue even after being on a call with them for over 30 mins! I had to try out Spider-Man 2 on my PS5; and I know I am way too late in doing so. But anyways, I needed a screen and so I connected to the TV in my room and turned it on but I had no remote to change the input to HDMI3. I looked and searched and found but no luck! Xiaomi has a Mi Remote app and so, I...