Whatsminer M66S++ REL2 Firmware - 4 versions
REL2 is the current firmware version line for Whatsminer M66S++. These are routine update builds - 4 REL2 versions listed below, the latest from 2026-04-16. Pick the most recent one for your miner, but keep in mind: you need NeedUpgradeAgain firmware to move from REL1 to REL2, and rolling back to the previous REL line is not possible.
REL2 (4)
★ Recommended
20260416.14.Rel2 REL2 normal h616 2026-04-16 · 41.5 MB
20251209.16.Rel2 REL2 normal h616
2025-12-09 · 41.7 MB
20251016.14.Rel2 REL2 normal h616
2025-10-16 · 32.2 MB
20250915.16.Rel2 REL2 normal h616
2025-09-15 · 32.2 MB
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