FEZ config stuck on erasing sector

Hello everyone, i am trying to deploy a hex file onto the raptor, but then after connecting and rebooting, the FEZ config just stucks on the “erasing sector…” screen. What could be the problem and how do i fix it?

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@ Tumza125 - Which version of sdk do you use ? TinyClr or SDK ?
Is it the first time you use raptor ?