But, you must change the partition type for usb (6.02/6.1) from gpt to mbr, and do copy files to converted partitions.
I also have atom 230 (not 330, but the same), it can run DSM 6.1.x.
But, I can't run dsm 6.2 on my hardware. that's my problem.
I did this work for my system (atom230). atom230 supported mbr only, and I can't change my bios setting (there was no method)to support for (U)EFI/GPT.
manually I did partitons (2 partitons) and cp files from gpt image.
anyway I think this work is great.