Yes. Start with US/EU version 4.50 GUPDATE.GCD and create 087001000450.rgn using RGN_Tool then flash with Updater.exe [provided your unit can reach preboot of course, you have said it can't so i assume it can]. Don't worry about the other files like voices yet seeing you can't reach MSM anyway. If it's partly bricked we'll have to cure it anyway.
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