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Hello, it is either to buy blackminer F1 Mini, but if you want to try bigger investment we're currently have a refurbished BTU9P , it is a good board that can mine the upcoming X16R Algo :)
We have a very guide here to start FPGA Mining : https://fpga.guide/en/guides/ (it is very practical and easy to follow)
You can hit us up to ask more question on telegram or email, we'll be happy to help you.