The Entries Bulk Upload CSV does not support the update action. The Entries Bulk Upload XML supports the update and delete actions. Entitlement related CSVs support update and delete actions for Categories, End-users, and End-user Entitlements.
It is required that you batch the jobs for any bulk action. For any bulk actions that will create / edit / delete more than 5,000 entries or users, including Categories bulk uploads, please submit as batches of 500. If you are using the API, please batch as 500, sleep for 15 minutes, then submit the next batch of 500.