An overview of the process used to mass update records types using the Data Loader.
If you've never used the Data Loader before, please review the Data Loader Guide.
Note: First, run a small test by choosing 2 to 3 records. This is because changes are not reversible and can only be corrected by performing another update through Data Loader.
To bulk update record types, you must first prepare a CSV file with record IDs and the target RecordTypeID, then use Data Loader's Update operation to apply the changes. Note that changes are irreversible — always test with 2–3 records first.
First, identify the specific IDs of the records that you wish to update. There are two ways to do this:
To locate Record Types in Lightning Experience
https://na1.salesforce.com/setup/ui/recordtypefields.jsp?type=Lead&setupid=LeadRecords&id=012300000000MWm
Support Video:
How to Download and Install Data Loader
How to Change or Update Record Types with Data Loader
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