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Finally it worked. The USB Stick must be fresh formatted in FAT32 and the Files must be in Root. The Stick ( i used a Kingston 4GB Mini Stick) must be plugged in, before you Power on. I tried many Hardresets before it started to reflash. No it works again.

hi, Firmware Upgrade of my AVC798A failed because of power failure. Hard reset doesn't work! There is only Screen: H264 System inital. and nothing more Is there a procedure to reflash it to bring my AVC798A back to life? Please help me