Stock firmware restrictions and supported install paths change over time. Use the full build, miner model and control board together before selecting any recovery or update method.
Pre-flight record
Input
Record
Why it matters
Exact model
Full chassis model and revision
Similar product names can require different files
Control board
XIL, AML, CV, BB or exact part number
Board images and recovery methods are not interchangeable
Current build
Full version and date string
Some builds restrict direct installation
Cooling
Air, hydro or immersion
Control and safety behaviour differs
Target method
Update, NAND, SD recovery or vendor tool
Update and recovery packages serve different purposes
When direct update may be inappropriate
The current interface rejects third-party packages.
The package target does not exactly match the board.
The miner is unstable or loses power/network.
You do not have a tested recovery path.
The current vendor instructions contradict an older date rule.
Safe next step
Keep the current configuration and original image.
Use the model guide as a starting point.
Verify current primary documentation.
Prepare the correct recovery media.
Test one miner during a maintenance window.
Why this page avoids universal date rules: a remembered month range can become outdated and may not cover every board or regional build. The full build identifier and current model-specific instructions are safer evidence.
VNISH Guides