Hi there,
I have a Sony Bravia with Android TV.
Is there any way to have a custom home/bootup screen, where I can choose a custom wallpaper and some Material Icons for Netflix, Youtube, Amazon Prime as well as my favorite Input channels (HDMI1, HDMI2...). Can I do that without having to use a custom firmware and with using an add and bloatware free App?
Yes, you can. I did it with my TV, check the guide I wrote a while ago:
https://www.reddit.com/r/bravia/comments/czuo7q/guide_android_tv_debloat_and_customization/?utm_medium=android_app&utm_source=share