The Yamon cable can be used to recover an AZBox HD stuck in BOOTING..., when trying to flash alternative software. Manuals and tools about the BOOTIING recovering procedure can be found at this link

The use of this cable is is for your own risk and you may lose your warranty.

If your AZBox HD is stuck in BOOTING you can contact your Azbox HD reseller or contact Smart Innovations Zutphen B.V. for repair.