Jam problem

[Guest nerox1]

i have Dopod 818 Pro (I-MATE Jam) chinese language i try to update it to english but in upgrade the upgrade stop

now the device don't turne on , the divce give me serial and usb i try to update agine via usb and i update it the first step go ok but in the radio update it stop again (do any professional one have any idea) the jam still give serial and usb