Which firmware options are available for Bitmain Antminer S21 series?

For Bitmain Antminer S21 series, the directory lists firmware sources and notes. Common options include: NiceHash Firmware (NHFW) (availability depends on the exact control board and sub‑model).

How do people search for Antminer S21 series firmware?

Typical queries include: stock firmware, official firmware update, and model‑specific searches like “Antminer S21 series VNISH” or “Antminer S21 series Braiins OS+” (where supported).

Is it safe to use custom firmware?

Use official sources, confirm control board compatibility, keep a rollback plan, and be aware custom firmware may affect warranty.

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Bitmain · Antminer S21 series

Popular search queries for Antminer S21 series

Copy/paste these into search when looking for firmware for this model.

NiceHash firmwareNHFWNiceHash firmware downloadAntminer S21 series firmwareAntminer S21 series stock firmwareAntminer S21 series custom firmwareAntminer S21 series VNISH firmware

Popular firmware names for this model: NiceHash Firmware (NHFW). Use the “how people search” chips to find the right firmware faster (for example: “Antminer S21 series VNISH”, “Antminer S21 series Braiins OS+”, “Antminer S21 series LuxOS”, “Antminer S21 series stock firmware”).

Algorithm / use: SHA-256 (Bitcoin) · Firmware types: Custom

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← Catalog Manufacturer: Bitmain Guide: Bitmain Antminer S21 series firmware

Firmware name	Firmware	Type	Links	Notes	Tags	Verified
NiceHash Firmware (NHFW) search: NiceHash firmware, NHFW, NiceHash firmware download, Antminer S21 series firmware, Antminer S21 series stock firmware, Antminer S21 series custom firmware, Antminer S21 series VNISH firmware	NiceHash Firmware (NHFW)	Custom	official · evidence	Supported models list and instructions are in the NiceHash knowledge base.	asic;custom	2026-02-04
NiceHash Firmware (NHFW) search: NiceHash firmware, NHFW, NiceHash firmware download, Antminer S21 series firmware, Antminer S21 series stock firmware, Antminer S21 series custom firmware, Antminer S21 series VNISH firmware	NiceHash Firmware (NHFW)	Custom	official · evidence	Supported models list and instructions are in the NiceHash knowledge base.	asic;custom	2026-02-04

Related models and popular firmware

Internal linking: similar models and common firmware names for this brand.

Popular firmware

Braiins OS+LuxOSBiXBiT FirmwareBitmain Antminer stock firmwareNiceHash Firmware (NHFW)Awesome Miner (Antminer Firmware)Hiveon ASIC FirmwareMSKMINERS FirmwareVNISH Firmware