ASIC firmware downloads / ASIC specifications
ASIC.TOOLS / FIRMWARE
Bitmain Antminer S21 Immersion (301Th) firmware
Official firmware versions matched to the exact ASIC model or manufacturer family. Local copies include SHA-256 checksums.
Firmware is hardware-specific. Match the exact model and control-board revision, back up settings, use stable power, test one miner first, and never interrupt an upgrade. A wrong image can make the controller unbootable.
Official manufacturer firmware
1 versionsExact model Official source: BITMAIN Product Manual & Firmware ↗
| Version | Published / updated | Compatibility | Size | SHA-256 | Download |
|---|---|---|---|---|---|
| 202408061155Antminer-S21Imm-AML-release-202408061155.bmu | 2024-08-12 | ANTMINER S21 lmm. | 14.4 MB | — | Official listing; local copy unavailableOfficial source ↗ |
| Release notes: MD5:92f7f01581c49f0d3742b2ce4029d9 91 ANTMINER S21 lmm. initial firmware. Please make sure the miner type and firmware type are the same before upgrading the miner firmware. | |||||
Verify the downloaded file with SHA-256 before uploading it to a miner.
Sources checked 14 September 2026