Try to replace the Power Supply (PSU, but use exactly the same model in Voltage and +/- position on connector !, should be at least 3 Amp or more), as it could have failed. Try to remove if there is inside the HDD and any USB device, smartcard in the front panel. To reduce the consumption of the box so the PSU can give enough power for the Flash chip to be programmed. Try to put the PSU plug directly into the wall power plug, and not in a multiple power plugs band... to be sure the PSU has enough power to give to the box.

If this doesn't resolve the issue, then you have to get in touch with Johnny, on hardware section and his forum jb8a8f8.com

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