Flash Tools
Firmware flashing tools for ASIC mining hardware. SD card imaging, NAND re-programming, and recovery tools for Antminer, Whatsminer, and Avalon.
Overview
Flash tools are used to write firmware images to SD cards, USB drives, or directly to the miner's NAND flash. These tools are essential for firmware updates, recovery from bricked devices, and deploying custom firmware.
Flashing Risks: Writing incorrect firmware to a miner's NAND can permanently brick the device. Always verify the firmware file matches your exact hardware model and revision. When possible, use SD card boot first to test before writing to NAND.
SD Card Imaging Tools
Balena Etcher
The most popular tool for flashing firmware images to SD cards and USB drives.
Balena Etcher
v1.19.21Cross-platform SD card and USB drive flasher. Simple three-step process: select image, select drive, flash.
Rufus (Windows)
Rufus
v4.5Lightweight Windows utility for creating bootable USB drives and SD cards. Faster than Etcher for large images.
Win32 Disk Imager
Win32 Disk Imager
v1.0.0Windows tool for writing raw disk images to removable devices. Supports reading back images for backup.
Command-Line (macOS / Linux)
No additional tools needed — use dd:
# Identify the SD card device
# macOS
diskutil list
# Linux
lsblk
# Write image to SD card (replace /dev/sdX with your device)
sudo dd if=firmware-image.img of=/dev/sdX bs=4M status=progress
syncDouble-check the target device before running dd. Writing to the wrong device will destroy all data on that disk. The target should be your SD card, NOT your system drive.
NAND Flash Programming
For advanced recovery when SD card boot is not available or when the control board's NAND is corrupted:
CH341A NAND Programmer
CH341A Programmer Software
v1.34Software for the CH341A USB NAND/SPI flash programmer. Used for direct NAND re-programming on bricked control boards.
NAND re-programming requires physical access to the control board and a CH341A (or similar) programmer. This is an advanced procedure that requires desoldering the NAND chip or using a SOIC clip. Only attempt if you have experience with flash programming.
NeoProgrammer
NeoProgrammer
v2.2.0.10Modern NAND/NOR flash programming software. Supports CH341A, RT809H, and other programmers. Large chip database.
Brand-Specific Flash Tools
Bitmain Antminer
- SD card method: Supported on all modern Antminer models
- Web UI flash: Upload
.tar.gzvia web interface - SSH flash: SCP file and run
runme.sh - NAND recovery: CH341A programmer for bricked control boards
MicroBT Whatsminer
- WMTool: Official tool for firmware management (see Diagnostic Software)
- SD card recovery: Supported with specific file naming conventions
- USB recovery: Some models support USB flash drives
Canaan Avalon
- Raspberry Pi controller: Flash controller image to SD card
- Module firmware: Pushed from controller via web UI
- AUC firmware: Updated via controller software
SD Card Recommendations
For reliable firmware flashing, use quality SD cards:
| Feature | Recommendation |
|---|---|
| Capacity | 4-32 GB (larger cards may not be detected) |
| Speed | Class 10 / UHS-I minimum |
| Format | FAT32 (required for most miners) |
| Brand | SanDisk, Samsung, Kingston (avoid no-name brands) |
FAT32 limitation: SD cards larger than 32 GB are typically formatted as exFAT by default. You must manually format them as FAT32 using a tool like FAT32 Format on Windows, or mkfs.vfat on Linux.
Troubleshooting Flash Issues
| Problem | Cause | Solution |
|---|---|---|
| Miner doesn't detect SD card | Wrong format or too large | Use ≤32 GB card formatted as FAT32 |
| Flash fails at X% | Corrupted download | Re-download and verify checksum |
| Miner boots but has issues | Wrong firmware version | Verify hardware revision matches firmware |
| LED blinks but never finishes | Power supply issue | Ensure stable power during flash |
| "Invalid image" error | Wrong file format | Ensure correct .tar.gz or .img for your model |
Related Resources
Diagnostic Software
Download network scanners, monitoring tools, and diagnostic software for ASIC mining hardware. IP scanners, fleet monitoring, and health check tools.
Serial Terminal Apps
Serial terminal applications for ASIC miner debugging. UART communication tools for control board diagnostics, firmware recovery, and low-level troubleshooting.