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Old 03-21-2009, 08:42 AM   #2 (permalink)
Dubdub's Avatar
Join Date: Nov 2005
Location: New Hampshire
Model: App6+
PIN: Ask
Carrier: ATT & Verizon
Posts: 20,038
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Error 507 is no OS, I think. Try to wipe the device using Jl_cmdr (see the FAQ for more info). Then use DM 4.2 SP2/SP3 rather than DM 4.7 Make sure you are downloading and installing a 7520 OS and delete the vendor.xml file before you install it.

And be patient as it runs. Could take an hour or longer.
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