Hi,
Debian system HDMI resolution is determined by the TF card script.bin boot partition root, the default is the use of 720p-60Hz
Resolution. Under the script directory boot partition has several other resolutions scrpit.bin, Suppose you need to 1080p-60Hz resolution,
Just use script / script-1080p-60Hz.bin replace the root directory script.bin:
# in TF card boot partition
cp script/script-1080p-60Hz ./script.bin
Thanks!