Try again, I though I read that user M9702USB seems ok, but I will try another to be safe. File is definitely in there (inside the UPG folder)
had to try the Mtktool a couple of times in order for the bootloader to get the firmware to upgrade/install.
FYI: the downgrade.bin is a bootloader to get the Mtktool and the M9702 to put the Main20xcn.bin on USB Flash drive to upgrade process. I know by looking at all the instructions on how to use the Mtktool its a sensative and tricky firmware update procss.
Let us know how it goes.
Just wish there was a simpler way to do it. Hoping for the Oppo Normal Firmware Update process if and when that main20xcn.bin can be made into the upgrade bin version..?
Update: I see you did it! Great! So it was the flash drive. Is it a size that the mtktool doesnt like because I have a 256GB usb 3.0 flash drive and it work fine for me via the Oppo 203 firmware update on my Oppo 203.