A factory reset and a firmware recovery are not the same operation, even though both are often suggested when an ANTMINER stops behaving as expected. A factory reset restores the miner's default settings through a supported button sequence or the web interface; the exact method and result vary by model and firmware version. Firmware recovery is a deeper remediation step that reloads the control board's software, typically through a model-specific SD-card image, and may be appropriate for corrupted or incompatible firmware or a control-board configuration fault. An unreachable web interface alone does not establish that firmware recovery is needed; network and access problems should be checked first. Neither process repairs a failed hashboard, fan, power supply, cable, or network connection, which Bitmain documents as separate categories of ANTMINER failure.
This article focuses on the decision of when each process is appropriate, what configuration data is likely to be lost, and what should be recorded beforehand — particularly relevant when a miner is being resold, relocated, or handed off to a new operator. It does not repeat firmware upgrade procedures, which are covered separately.
Decide whether reset is necessary
Start by checking the miner's network connection, IP address, and login access. If you can log in, first try correcting an incorrect pool entry, network setting, or performance mode directly. If a forgotten administrator password or a configuration problem prevents access, consider a physical reset using the instructions for the exact model. A reset returns settings to a known state; firmware recovery should follow the model's troubleshooting guidance when the control board's program needs to be restored. Neither choice should be based solely on whether the web interface loads.
A reset should not be treated as a general first step for every fault. Bitmain's troubleshooting documentation separates configuration issues from hardware and connectivity problems — hashboard faults, fan failures, power-supply issues, and cabling or network faults are listed as distinct causes with their own diagnostic paths (Bitmain, ANTMINER failure troubleshooting). Resetting a miner that shows zero hashrate because of a disconnected hashboard cable, for example, will not resolve the fault and may erase configuration data that would otherwise help with diagnosis.
A reset also restores the device's default administrator login. The exact default username and password can vary across ANTMINER models and firmware branches, so the reliable source is the official user guide or support article for the specific model rather than a value copied from an unrelated guide or forum post. Treating a reset as a security event — not only a configuration event — matters because an unattended miner with default credentials is reachable by anyone on the same network segment.
Preserve worker and pool settings
Before initiating a reset or a firmware recovery, it is worth recording the settings that are likely to be cleared or replaced. At minimum, this includes:
- The ANTMINER model, serial number, and current firmware version shown in the web interface
- The primary and backup pool Stratum URLs, ports, and worker names, along with pool-entry priority if more than one pool is configured
- Network settings: whether the miner uses DHCP or a static IP address; if configured manually, record the IP address, subnet mask, gateway, and DNS values
- The performance mode or power profile currently in use, if it has been changed from the default
- Any current logs or screenshots of error messages, temperatures, and fan status, which are useful if a hardware fault is still being diagnosed
If the web interface is inaccessible, collect whatever remains available from previous records, device labels, or saved screenshots. Access to the interface is not a prerequisite for recording useful information.
Pool settings deserve particular care because a pool URL is not a payout address. The miner only needs pool connection details and a worker identity; the wallet address or payout configuration associated with a mining account is normally managed in the pool account itself, not on the miner. As a current example, ViaBTC's BTC mining setup documentation lists specific Stratum endpoints and a worker-naming format of userID.workerID, where the worker-ID portion is limited to lowercase letters and numbers (ViaBTC Help Center, BTC Mining). Endpoint details and format rules can change, so verify the current endpoints and naming rules on the pool's official setup page. Keep a separate record of your own account and worker identifiers; the worker names shown in setup examples are not values to copy into your miner.
Reset vs reflash
A factory reset and a firmware reflash (the mechanism behind most firmware recovery procedures) act at different levels of the device. A reset restores default settings through the existing firmware — it does not necessarily replace the firmware itself. Bitmain's general reset documentation notes that, in some procedures, the miner returns to its original firmware after reset, which may then need to be updated separately to the latest version (Bitmain, How to reset miner to factory settings). A reset should therefore not be described as a guaranteed firmware update.
Firmware recovery goes further: it reloads the control board's software using a recovery image, commonly applied through an SD card when the model's troubleshooting guidance calls for restoring the control board's program. Bitmain's troubleshooting guidance lists flashing the control board with an SD card as the documented response to a control-board configuration fault. This process installs whatever firmware or recovery image is used for that procedure, which may not match the version previously installed on the miner — another reason to record the firmware version beforehand.
Because recovery operates at the control-board level, a miner that boots normally and shows a working web interface after recovery has only had its software path restored. It has not been confirmed that the hashboards, fans, power supply, or sensors are functioning correctly; those require separate checks, such as reviewing reported temperatures, fan speed, and board detection after the miner reconnects to the pool.
Use model-specific instructions
Reset and recovery procedures differ across ANTMINER generations, and applying instructions written for one model to another can produce unexpected results or simply fail. Bitmain's general reset article describes an older reset-button method — press and hold the reset button for about five seconds after the miner has been powered on for between two and ten minutes, after which the miner restores its settings and restarts within a few minutes. Newer product documentation can specify a different sequence; for example, Bitmain's S21 User Guide, §3.4 (March 2025 edition) instructs the operator to let the unit run for five minutes before holding the reset button for ten seconds.
This variation is the practical reason to treat a reset tutorial written for one ANTMINER series as a starting reference rather than a literal instruction set for a different model, including between S19-series and S21-series units. Before acting, the official user guide or support article for the exact model — and, where applicable, the control-board revision — should be consulted, since Bitmain documents the procedure separately for each product line rather than as a single universal sequence.
Reconnect and secure the miner
After a reset or a firmware recovery completes, the miner needs to be reconfigured and checked before it is considered operational again. For the same operator at the same site, use the recorded settings after checking that they remain valid. When a miner is resold or handed off, configure the receiving operator's pool account and worker identity; when it is relocated, use settings appropriate for the destination network rather than automatically restoring the old values.
A practical sequence includes:
- Reconnecting the miner to the network and applying the appropriate network settings, using the recorded static IP details only if they remain valid for that network
- Verifying the current Stratum URL against the pool's official setup page, then entering your own account and worker identifiers in the required format; for ViaBTC, use your own
userID.workerID, not the example worker name - Changing the default administrator login immediately, since both reset and recovery can restore or install default credentials
- Reviewing the kernel or historical log, fan readings, and temperatures to confirm the miner is behaving normally, not only that the interface loads
- Checking the pool dashboard after the miner has had time to stabilize, to confirm the worker appears as connected and is submitting shares
ViaBTC's documentation suggests allowing roughly ten to fifteen minutes after reconnection before checking worker status and reported earnings, which is a reasonable operational reference rather than a fixed technical threshold. Sourcing the pool URL and any companion mining software only from the pool's official documentation is also worth emphasizing: ViaBTC has published a notice specifically warning users to rely only on its official pool URLs and Mineragent downloads rather than unofficial copies that may circulate online (ViaBTC Help Center, official pool URL notice). The same caution applies to firmware recovery images: using an image intended for the wrong model or control-board revision is a common cause of recovery failures, so the file should come from the manufacturer's current, model-matched documentation.
FAQ
Does an Antminer factory reset update the firmware?
Not necessarily. Some reset procedures return the miner to its original firmware rather than the latest version, so the firmware may need to be checked and updated separately after the reset completes.
Will a factory reset erase my pool settings?
Yes, pool URLs, worker names, and connection priority are commonly cleared or restored to defaults during a reset, which is why recording this information beforehand is recommended.
What is the default administrator password after a reset?
Default login credentials can vary by ANTMINER model and firmware version. The reliable source is the official user guide or support article for the specific model rather than a value found in an unrelated guide, and the default password should be changed immediately after regaining access.
Does resetting an Antminer S19 use the same steps as other models?
Not always. Reset timing and button sequences differ across ANTMINER generations, so the procedure for an S19-series unit should be confirmed against that model's official documentation rather than assumed from a different series.
Can firmware recovery fix a miner that shows zero hashrate?
Firmware recovery may resolve some firmware or control-board configuration problems that cause zero hashrate. Check the error logs and follow the troubleshooting guidance for the specific model to determine whether recovery is appropriate. It cannot repair physically damaged hashboards, fans, power supplies, or cables, which require separate diagnosis and repair.