Antminer Stock Firmware
Official Bitmain stock firmware downloads for all Antminer models. Version history, compatibility matrix, and installation instructions.
Overview
Bitmain's stock firmware is the factory-installed firmware on all Antminer devices. It provides stable performance with official hashrate and power consumption figures. Stock firmware receives periodic updates for bug fixes, performance tuning, and security patches.
Flashing Risks: Incorrect firmware flashing can permanently brick your miner. Always verify the firmware file matches your exact model and hardware revision before flashing. Keep a copy of your current firmware as backup.
Why Use Stock Firmware?
- Official support — Bitmain warranty remains valid
- Stability — thoroughly tested on target hardware
- Security patches — regular updates for known vulnerabilities
- No license fees — included with hardware purchase
- Pool compatibility — guaranteed compatibility with all major pools
Latest Versions by Model
S21 Series
| Model | Latest Version | Release Date | Notes |
|---|---|---|---|
| S21 | 49.0.1.3 | 2025-12-15 | Performance optimization, fan curve tuning |
| S21 Pro | 49.0.1.3 | 2025-12-15 | Shared firmware with S21 |
| S21 XP | 49.0.2.1 | 2026-01-20 | Hydro cooling support improvements |
| S21+ | 49.0.1.5 | 2026-02-10 | New model support |
Antminer S21 / S21 Pro Stock Firmware
v49.0.1.3Official Bitmain firmware for S21 and S21 Pro models. SHA-256 algorithm.
Antminer S21 XP Stock Firmware
v49.0.2.1Official firmware for S21 XP hydro-cooled model.
S19 Series
| Model | Latest Version | Release Date | Notes |
|---|---|---|---|
| S19 | 49.0.1.3 | 2025-10-20 | Final maintenance release |
| S19 Pro | 49.0.1.3 | 2025-10-20 | Shared firmware |
| S19j Pro | 49.0.1.3 | 2025-10-20 | Shared firmware |
| S19 XP | 49.0.1.5 | 2025-11-15 | Performance tuning |
| S19k Pro | 49.0.1.3 | 2025-10-20 | Shared firmware |
| S19 Hydro | 49.0.2.1 | 2025-11-15 | Cooling system updates |
Antminer S19 Series Stock Firmware
v49.0.1.3Official firmware for S19, S19 Pro, S19j Pro, and S19k Pro models.
Antminer S19 XP Stock Firmware
v49.0.1.5Official firmware for S19 XP with BM1368 chips.
Legacy Models
| Model | Latest Version | Release Date | Status |
|---|---|---|---|
| S17 / S17 Pro | 49.0.1.3 | 2024-06-15 | End of life |
| S17+ | 49.0.1.3 | 2024-06-15 | End of life |
| S9 / S9i / S9j | 49.0.1.3 | 2023-12-01 | End of life |
| L7 | 49.0.1.3 | 2025-06-20 | Maintenance only |
| L3+ | 49.0.1.3 | 2023-06-01 | End of life |
Antminer S17 Series Stock Firmware
v49.0.1.3Final firmware release for S17, S17 Pro, and S17+ models.
Antminer L7 Stock Firmware
v49.0.1.3Official firmware for L7 Scrypt miner.
Installation Instructions
All firmware downloads are available from Bitmain's official service portal. We link to official sources only — AZIC does not host firmware files.
Method 1: Web Interface (Recommended)
- Navigate to your miner's web interface (usually
http://<miner-ip>) - Log in with your credentials (default:
root/root) - Go to System → Firmware Upgrade
- Click Choose File and select the downloaded
.tar.gzfile - Click Upgrade — do not power off during the process
- Wait 3-5 minutes for the miner to reboot
Method 2: SD Card Recovery
Use this method when the miner is unresponsive or has corrupted firmware:
- Format a microSD card (≤32 GB) as FAT32
- Extract the firmware
.tar.gzto get the recovery image - Copy the recovery files to the SD card root
- Insert the SD card into the miner's slot
- Power on — the miner will flash automatically
- Wait for the status LED to stop blinking (5-10 minutes)
- Remove the SD card and reboot
Method 3: SSH Flashing
# SCP the firmware to the miner
scp firmware.tar.gz root@<miner-ip>:/tmp/
# SSH into the miner
ssh root@<miner-ip>
# Flash the firmware
cd /tmp && tar xzf firmware.tar.gz
./runme.shNever flash firmware during a power outage or unstable connection. A failed flash can permanently brick the control board, requiring NAND re-programming or board replacement.
Rollback Procedures
If a firmware update causes issues:
- Web interface rollback — Some versions support dual-boot partitions. Access System → Firmware → Switch Partition
- SD card recovery — Use the previous firmware version with the SD card method above
- NAND re-flash — For severe cases, connect via UART and re-program the NAND flash. See Firmware Recovery Guide
Known Issues
| Version | Issue | Affected Models | Workaround |
|---|---|---|---|
| 49.0.1.2 | Fan speed reporting inaccurate | S21, S21 Pro | Update to 49.0.1.3 |
| 49.0.1.1 | Hashrate drops after 72h uptime | S19 XP | Scheduled reboot or update |
| 49.0.1.0 | Web UI freeze on Safari | All models | Use Chrome/Firefox |
Official Download Portal
All stock firmware is available from Bitmain's official channels:
- Bitmain Service Portal: service.bitmain.com
- Bitmain Support: support.bitmain.com
Download only from official sources. Firmware from unofficial sources may contain malware that redirects your hashrate to an attacker's wallet. Always verify SHA-256 checksums after download.
Related Resources
- VNish Custom Firmware — enhanced performance and autotuning
- Braiins OS+ — open-source alternative with autotuning
- LuxOS Firmware — advanced optimization firmware
- Flash Tools — utilities for firmware flashing
- Firmware Recovery Guide