Instructions of new multi-option firmware

Four multi-option security firmware have been released to support S9, S9i, S9j and T9 + miners respectively. The firmware does not support the miners which are using the C5 control board(only for few of S9 miners). It doesn't matter to upgrade the new firmware by mistake. The firmware will automatically check the type of control board. If it is C5, firmware will skip the upgrade and the version number of the miner will not be changed after the operation.

A drop-down menu of “Working Mode” has been added to the “Miner Configuration” web page of the miner. You can choose the appropriate option to improve the hash rate, or choose the corresponding option to reduce the power consumption. It is suggested that using Antpool/BTC.com tools to set the option simultaneously for multi miners.

The multi-option drop-down menu screenshot of S9/S9i/S9j is as follows:

The multi-option drop-down menu screenshot of T9+ is as follows:

Drop-down menu description:

1. NOT Recommended to Upgrade to Multi-Option Firmware

(1) Miners have the following issues:

While running the normal firmware, the hash rate is more or less 5% less than the ideal hash rate, lacks hash boards or chips, unstable hash rate, etc.

(2) Power supply has the following issues:

Power below 1400W, unstable power supply, etc.

2. Power Supply Requirement and Option Adjustment Suggestions

(1) For S9/S9i/S9j miner:

+0.5T option can be supported by 1400W power supply,

+1.0T/+1.5T/+2.0T options can be supported by 1600W power supply.

(2) For T9+ miner:

1600W power supply can support up to 12T hashrate after the over-frequency.
1800W power supply is needed if the hashrate is equal or more than 12.5T after the over-frequency.

Note: Considering conditions, due to the difference between the power supply and miners, Evenif the power supply is within the recommended range, it may not work properly.

(3) You can refer to the following suggestions to use over the frequency options:

First, run in the “Normal” option for some time. If it is stable, then select +1.5T option. If the miner can run in +1.5T option with a  stable condition, considering the power supply and room temperature, it is then possible to continue to select +2.0T option; if +1.5T option is not stable, it is suggested to downgrade the option to +1.0T/+0.5T.

3. The conditions recommended to use a lower over frequency option

(1) Power supply has the following issues:

Unable to supply current over frequency option, power failure and so on.

(2) Miners have the following issues:

 Over temperature protection (real-time hash rate is 0), lack of hash boards or chips, insufficient hash rate and so on.

4. Normal situations after using over frequency option

(1) The hash rate is 0.5T less than the target:

For example, the miner hash rate is 14T, select +2T option, the actual hash rate reaches 15.5T. In this case, we can stay in the current setting or downgrade the option to +1.5T.

(2) The hash rate is 0.5T higher than the target:

For example, the miner hash rate is 14T, select +2T option, the actual hash rate reaches 16.5T. We can choose to stay in the option for this situation.