T56 can't detect mainbord via vga isp

Mainboard  MSD286 *35014798
CPU          MSD286GQ-LF-Z1-SJ
SPI          S25FL128P

T56 can't connect with this mainbord via vga isp, T56 VGA/HDMI Device list max capacity is 8MB, How can backup spi flash 16MB via vga isp?

I tried with rt809h and it works .
In the attachments there is a report file for this mainbord with postal .
I want to completely stop using RT