Only do this if you have verified that your unit is HWID 1582: Remove gupdate.gcd from .System folder if existing. Extract this file somewhere convenient, Desktop will do: [Only registered and activated users can see links. ]. Open Updater folder then drag 158201000460.rgn onto Updater.exe. Connect your unit in preboot, when its details appear in window adjacent to 'USB Device' press 'OK' immediately. If you're right about V7.70 it's probably HWID 2077 [C4] so there's not a solution at present!
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