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ASIC.TOOLS / FIRMWARE

Download Bitmain Antminer S21+ (225Th) Firmware

Download firmware for Bitmain Antminer S21+ (225Th) from the official source. Versions: 1. Check compatibility and release details; local copies are unavailable.

Bitmain Antminer S21+ (225Th)

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.

Available versions

1 version
Exact modelOfficial source: BITMAIN Product Manual & Firmware ↗
Version

FR-1.40

FR-1.40(260721-S21+).bmu

Local copy unavailableOpen official source ↗
Published / updated
2026-08-31
Compatibility
ANTMINER S21+
Size
16.3 MB
Check file integrity · SHA-256

SHA-256

—

MD5

0cd7364656229372177d789974f16791

Verify the downloaded file with SHA-256 before uploading it to a miner.

Release notes

MD5:0cd7364656229372177d789974f16791 Updates： 1. Optimized firmware. Please make sure the miner type and firmware type are the same before upgrading the miner firmware.

Official source ↗

Sources checked 14 September 2026