Can't seem to find any significant error on verbose boot, but upon reaching the install screen, graphics are not laggy, keyboard & touchpad are working.
Here I successfully created the partition for installation:
Primary MBR (disk0s3):
Then this error:
BIOS settings are OK (Legacy mode ON, Secre Boot OFF, USB boot priority)
MD5 sum of raw file already checked and matched;
So I am still wondering if my laptop is not supported for Sierra install...