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Version 4.27.20 was released to support the integration levels (I-Steps) found in BMWs manufactured or updated around early 2021. Using this version allows you to:

Ensure this matches your ISTA/E-Sys version to avoid connectivity issues. v.4.27.20 psdzdata lite download

Newer versions exist (e.g., v.4.35.12, v.4.39.30), so why stick with 4.27.20? Version 4