## The problem
Issue minio/minio#20845 (closed, 22 comments): ## NOTE
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[!--- Provide a general summary of the issue in the Title above --]
## Expected Behavior
## Current Behavior
New AWS SDK v2 (2.30.0) allows configuring request/response checksum validation.
when:
```
s3client.requestChecksumCalculation(RequestChecksumCalculation.WHEN_REQUIRED);
s3client.responseChecksumValidation(ResponseChecksumValidation.WHEN_REQUIRED);
```
```
DeleteObjectsRequest request = DeleteObjectsRequest.builder()
...
## What to do
New AWS SDK v2 checksum validation (requestChecksumCalculation / responseChecksumValidation) broke against older MinIO releases. Fixed in MinIO RELEASE.2025-01-20T14-49-07Z; the reporter confirmed it works, and a follow-up PR (#20878) covered remaining weird checksum settings. If your AWS SDK v2 checksum operations fail against MinIO, upgrade the server past that release.