WhatsMiner M21S historical identity record

Evidence-limited historical identity: a manufacturer article published June 3, 2020 names the WhatsMiner M21S as part of its installed historical fleet discussion. The attached primary sources do not provide an exact M21S specification sheet or a current product-manual entry.

Previous hashrate, wall power, efficiency, noise, physical, price, availability, and architecture values have therefore been withdrawn. This page establishes the historical model name only; it is not a current product or firmware record.

Identify a physical M21S

Record the complete nameplate, serial label without publishing private identifiers, raw reported platform, complete displayed type, installed version, cooling class, connectors, and current symptom. Do not infer specifications or recovery media from a nearby M20-series name.

Firmware and recovery

Historical model information does not identify firmware or recovery media. If a platform record is missing or conflicts, do not select a package.

• Confirm this miner’s platform before firmware or recovery.
• Only after identity is resolved, review the current official firmware and recovery scope.
• For no boot, missing or conflicting identity, or electrical or thermal symptoms, request WhatsMiner diagnosis.

Related historical records

M20S launch sample · M21 launch sample · current M-Series manual directory

Primary sources: manufacturer forum report naming M21S, June 3, 2020; and the current manufacturer manual catalog, checked August 27, 2026.