This is a way to escape the infinite recovery repetition of update 2 or update 3. You can migrate to a platform different from the platform you are currently using (e.g., from ds3615 to ds3622). After migration, you can migrate once more to the platform you want to use again. In the case of ds3615 and ds3617 that do not officially support SHR, it does not matter if the SHR is maintained for a while. You don't have to worry about data loss.