SD card method
Use SD when the miner needs recovery, when stock firmware blocks direct install or when you want a reversible first boot path. Format the card correctly and use the model-specific recovery image.
Installation guide
How to install VNISH firmware safely
A safe VNISH install is a sequence, not a download button: identify hardware, check stock firmware date, choose SD or NAND, verify checksums, flash a pilot unit and only then scale across the farm.
SD recoveryNAND installVOU updateVOU
| Step | Action | Do not skip |
|---|---|---|
| 1 | Back up pools, workers, IP settings and current firmware info | You may need this after recovery |
| 2 | Identify exact model and control board | Wrong board type is the most common install failure |
| 3 | Check Bitmain stock firmware date | Some builds require recovery before VNISH |
| 4 | Verify checksum and package type | Install and update packages are different |
| 5 | Flash one pilot miner first | Bulk deployment should follow proof of stability |
NAND method
Use NAND for production after compatibility is clear. NAND writes internal storage and should be done only with the correct model, board and package.
Bulk deployment
For farms, separate miners by model, board type, firmware state and cooling type. Run one rack only after a pilot miner survives a complete autotune cycle.
Frequently asked questions
What is the safest VNISH install method?+
SD recovery is safest for uncertain miners. NAND is best for stable production once compatibility is confirmed.
Can I update stock Bitmain firmware directly to VNISH?+
Sometimes, but not always. Stock firmware date and control board determine whether direct install is allowed.
What should I do before bulk flashing?+
Test one miner, export settings, verify temperatures and keep rollback/recovery available.
Related VNISH guides
Continue through the model, install and recovery pages before flashing production miners.