try this, pls report back if it works, did only test on dm800 boxes
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1) connect working box to dreamup, press connect
2) now plug in null modem in broken box, press flash and chose flash file
3) flash probably hangs
4) connect the broken box to dreamup, press connect and try flash, chose flash file, hopefully it works now
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1) connect dead box to dreamup, press connect
2) press ok at ca error popup
3) download enforcer, search google
4) drag enfocer in front om dreamup, press enable in enforcer
5)press flash and chose flash file
6) flash probably hangs
7) connect the broken box to dreamup, press connect and try flash, chose flash file, hopefully it works now