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This flashes the modem.bin file... which writes to a separate DevBlock (partition).. won't write to /system, /data, /boot, /cache. I flashed this MA4 modem over my LK7 modem (while running CleanROM v4.5).. works fantastic. I'd recommend backing up your current modem partition (in on TWRP), then flash this... if it doesn't workout better for you, restore your current modem.
Here is the modem from the 2/15/2013 ATT OTA update. Flash in the recovery of your choice.
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