Bitmain Antminer S21 (200Th) 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 versions

Exact model Official source: BITMAIN Product Manual & Firmware ↗

Version	Published / updated	Compatibility	Size	SHA-256	Download
FR-1.12FR-1.12(251009-S21).bmu	2025-11-20	ANTMINER S21	15.2 MB	`—`MD5: 45c6e3f115a05fa3e6a4a823d9fa500f	Official listing; local copy unavailableOfficial source ↗
Release notes: MD5:45c6e3f115a05fa3e6a4a823d9fa500f Updates： 1. Implemented slight frequency reduction and other optimization strategies for machines that may shut down due to high temperatures. 2. Enhance the stability of the 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