XModem is a common, easy to use file transfer protocol. XModem for FEZ is based on the C# sample from Andreas Wö gerbauer net.trackday.cc. With some modifications to make it work under NETMF, it should be possible to implement on the FEZ platform. Usage: Use XModem_FEZ.cs and CRC16.cs on the FEZ. Receiving a file can be done by using Tera Term, HyperTerminal, or XModem.cs in a client application. XModem_FEZ does work with Checksum and CRC, but Checksum is recommended.