Hi Vu,
With regards to your first question:
I would suggest you run the script called:
:6-1e Port A, 720p,1080i Any Color Space In (YCrCb 444 24bit from ADV761x) Through HDMI Out 444 YCrCb VIC[4,5,19,20]:
and then run the script called:
:ADV7611 EDID 8 bit only NO DSD or HBR Support:
With regards to your second question, I'm not sure I understand. The EDID data describes the resolutions/features that the DVI/HDMI sink equipment supports. The DVI/HDMI source equipment is supposed to read the EDID data of the DVI/HDMI sink equipment and only output modes that the sink equipment supports.
-Matt