The DualMiner USB Scrypt ASICs using a single GridChip GC3355 processors do come with a modified version of cgminer 3.1.1 supporting the device, but this is already quite old version of the software. There is a newer version of cgminer 3.5.0 modified for use with with the single chip DualMiner USB Scrypt ASIC that we have compiled it for windows users and you can download it form the link below. This new version provides more up to date features and should be more stable and user friendly for use, but there is one important difference in the way you need to access your single chip Gridseed USB ASIC with the new cgminer 3.5.0. Have in mind that this version of cgminer 3.5.0 is compiled only for use for scrypt mining with the single chip DualMiner USB Scrypt ASIC devices, it will not work on video cards or other ASCI devices. Note that this version of cgminer miner is also NOT compatible with the 5-chip GridChip GC3355 ASIC miners!

With cgminer 3.1.1 you had to select the virtual COM port that the USB ASIC attaches to when you install its drivers, but the new cgminer 3.5.0 does not use virtual COM port, but addresses the device as a USB one and should be able to autodetect it. In order for this to work properly you will need to replace the USB to COM driver with the WinUSB driver by using the program Zadig. What you need to do is to the following:

– Download and run the latest version of Zadig
– Select Options and choose List All Devices
– From the Dropdown list of devices select Dual RS232-HS (Interface 0) and click on Replace Driver with the WinUSB driver selected
– From the Dropdown list of devices select Dual RS232-HS (Interface 1) and click on Replace Driver with the WinUSB driver selected
– If you have multiple 1-chip GC3355 DualMiner USB devices connected you may need to repeat the procedure for all of them
– Edit and run the included LTC_ONLY.bat file from the cgminer 3.5.0 archive provides, it should autodetect the available devices and start mining on them

– You can download cgminer 3.5.0 for DualMiner USB Scrypt on Windows OS here…

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