To program the modem firmware loader into the system RAM, do the following steps.
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Unzip the modem firmware package and identify the modem firmware loader file (<digest identifyer>.ipc_dfu.signed_<version>.ihex) using the digest identifier retrieved in Reading the modem key digest.
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Write the contents of the modem firmware loader file to the RAM.
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Write 1 to address 0x4002A004.
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Poll IPC.MODEM_CTRL_EVENT and acknowledge the event.