Modify uuid value in Bulk Import

[mde-beneva]

Hello

I'm working on the migration from Alfresco 5 to Alfresco 7 and I want to keep the same uuid value between the two environments, I used the Bulk Export/Import for this migration, everything works correctly except for the uuid which is different between both environments!
I found this page which explains the modification of the metadata, but the bulk import process is in the compiled code, my question is how do I proceed to keep the uuid at the time of import?

Thanks