Windows BitLocker
As an administrator, you can bulk update of recovery key for a set of encrypted Windows 10 devices by uploading an Excel file with the device GUID and recovery password.
To upload the Excel file for the bulk update of recovery key:
- Go to the  Admin>Windows BitLocker.
 - Click Download sample csv file to download the sample CSV file to download and view an example of .csv file.
 - Create and add the records for the BitLocker recovery keys .csv file.
 - Click Upload recovery passwords
 - Click Choose File to upload the .csv file you have created.
 - Click Upload. Uploading a new file with previously uploaded keys will overwrite the old entries.
A maximum of 1000 records can be submitted in each upload. After a successful upload, you can view the individual keys in the device details of the specific device.