ASIC.TOOLS / FIRMWARE

Download Bitmain Antminer S21 Pro (234Th) Firmware

Download firmware for Bitmain Antminer S21 Pro (234Th) from the official source. Versions: 1. Check compatibility and release details; local copies are unavailable.

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-1.121

FR-1.121(260814-S21-Pro).bmu

Local copy unavailableOpen official source ↗

Published / updated: 2026-09-12
Compatibility: ANTMINER S21 Pro
Size: 16.0 MB

Check file integrity · SHA-256

SHA-256

—

MD5

9484d908225708d4e2f9d2644ff4a5ce

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

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.

Official source ↗

Sources checked 14 September 2026