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Sorry crz_boy, it souds like you have caused permanent damage to your module. Before updating, always use the AT+GSV command to identify exactly what firmware you aready have as there are differences in the flash used as well. So if your existing firmware is 1137B03SIM900M32_ST then you must only use a firmware version 1137B04SIM900M32_ST or B05 etc. Sorry I can't be more help. Get a new module check the firmware version and then only update with compatible firmware. You can always ask here if you are not sure.hi to everyone...
i update sim900 with sim900a update file...it's not work...then update again with the same update file..it's not work again..but this time i can't update again...it's not reset...what can i do?
it's input voltage drop to 2.5V...