ASIC firmware downloads / ASIC specifications
ASIC.TOOLS / FIRMWARE
Bitmain Antminer S21 Pro (234Th) 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 |
|---|---|---|---|---|---|
| FR-1.121FR-1.121(260814-S21-Pro).bmu | 2026-09-12 | ANTMINER S21 Pro | 16.0 MB | —MD5: 9484d908225708d4e2f9d2644ff4a5ce | Official listing; local copy unavailableOfficial source ↗ |
| Release notes: MD5:9484d908225708d4e2f9d2644ff4a5ce Updates： 1. Optimized 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