SIM900 Customer Flash Loader

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Sidaray

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Hi all,
Can i use usb to ttl or USB to Serial cable to upload the firmware to sim900, If any one know please let me know.

I purchased a new sim900 device, here i am trying to enter MMS AT Commands in hyper terminal it reflying error so can i upload mms firmware? If yes which one is better.. please help me any one
 

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