Is it possible to flash OFW 6.20 using the XGEN installer for 5.50 GEN-D? In order to switch from 5.50 GEN-D2 to 6.20, I currently have to use service mode to downgrade into 5.50 OFW then upgrade into 6.20. I want to shorten this process by using XGEN to flash OFW 6.20. Is this possible?