Hello
sorry for my english I'm french.
I followed the same steps as for a migration from 5.2 to 6.1 https://xpenology.com/forum/topic/6253-dsm-61x-loader/
change of the pid, vid and mac.
he recognized my records and offered me a migration.
I lost no data, it kept all my dsm settings.
the only change and obviously the sn of the dsm that changes.