ember 2.18 how to set a record back to isDeleted = false

i have a list of files, and a history of these files. when i delete a file in the current latest version, the ember store sets this file to isDeleted = true. so when i get the list of files for an older revision with this deleted file, it is hidden, because the ember store thinks it is deleted. so i tested to set the record with myFile.set('isDeleted',false); but it doesnt work.

note: i don't want a full rollback of attributes, i just want to make them set the flag isDeleted to false.