AI-generated source note. I work with JingleMining. This explains BITMAIN’s published policy, not a service decision for a particular machine.A used ANTMINER advertised as “back on stock firmware” still needs its operating and repair history checked. The firmware screen shows what is installed now. It cannot establish what software ran before, what settings were used, or whether parts were changed.
BITMAIN’s
After-Sales Maintenance Policy, updated 20 October 2025 and read 15 November 2026, separates paid maintenance from circumstances in which it will not provide maintenance. That distinction matters when budgeting for a used unit.
The firmware clauses do not all say the same thingSection 4.3.1(2) lists unauthorized firmware or hardware changes using third-party products under voided-warranty circumstances that may lead to charged maintenance. It also lists damage or failure caused by unauthorized firmware or drivers. Separately, section 4.2.1(2) places damage caused by third-party over-frequency software under non-maintenance.
Reading only the paid-repair section could therefore give the wrong impression that every excluded warranty case can simply be repaired for a fee. Reading only the over-frequency clause could also wrongly turn a damage-specific condition into a statement about every third-party firmware installation. Neither conclusion establishes the outcome for an individual miner.
For a prospective purchase, ask the seller to identify previous firmware, operating settings and repairs, including changed boards or power supplies. Keep that information with the unit’s identity and any available service records. If the history is incomplete, put that uncertainty to the service provider before relying on “remaining warranty” in the price comparison. Restoring the current screen is not an assessment of earlier damage.
Do not erase useful fault evidence merely to make the machine look reset. Section 3.2 calls for personal data to be backed up and removed before service, while retaining product logs and other data needed for testing and maintenance. Ask support how to handle the actual files privately.
The service provider still has to assess the machine under the applicable terms. BITMAIN’s policy also preserves applicable consumer-law rights and specific agreements; this note is not a legal determination or a promise of free, paid or successful repair.
