Load a DC save
Drop the character .vms file, or a whole VMU memory card image (.bin/.vmd/.VMU).
Search
This save's seed couldn't be worked out directly, so this is the old brute-force fallback. It can only find the seed if this console's two internal seeds happen to be the same value — on a console where they differ, no seed exists that this search will ever find, and it will simply run forever without one. There's no way to tell in advance which kind this is; if it hasn't found anything after a long while, that's likely why.
Runs across worker threads. Lower the slider if this tab is making your machine too hot or slow to use for anything else while it runs.
— (%) at /sec, ETA
Found it
Round-1 seed:
Paste this into the "Round-1 seed / serial number" field back in the editor.