If you require technical assistance with a DFRobot branded product, please contact the dedicated DFRobot tech support helpdesk via techsupport@dfrobot.com in the first instance.
Their product specialists and engineers can provide detailed technical support for troubleshooting any issues with their products.
If the DFRobot helpdesk deem your unit/product faulty or similar, please contact our friendly support team for help with a return.