Hi,
I don't think Downgrade is worth the stress.
Do you have any details about your hardware? We'd need more information to help.
Nano boot 5.0.3.1 should have a wide spectrum of hardware support.
Try booting nanoboot in upgrade mode to 4493 with only Display, LAN and keyboard connected, so no wifi or Bluetooth dongles. In upgrade mode you can use either the synology tool on your computer to 'migrate' the new version or type into the browser the IP of your NAS. Click that, type in the username and password you want to use and upload the original 4493 you get at synology. After upgrade your NAS will reboot. Be sure not to boot into upgrade, but normal nanoboot. The synology tool should detect your NAS and will write some more stuff onto your NAS. You can also login into the shell with the user and PW you just typed in.
Also.. you should have posted this into another thread or make a new one, but not this one..
Good luck
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I continue my post hehre : viewtopic.php?f=2&t=3354&p=19906#p19906