My TCL android TV says it supports 4k. When i play HDR content on Netflix , the HDR10 notification pops up. But when I check with any of the resolution check apps on the playstore they only show me 1920*1080. Youtube stats for nerds shows me viewport as 1920*1080*2 . HDR content on prime video never goes beyond 1080p while playing. This is driving me mad.
Search on Netflix for videos named "TEST PATTERNS".
Run each video in the series and pay close attention to the results, shown in yellow, at upper right of screen. Allow to stabilize after 60 seconds.
Turn down your volume during testing!!!!!