How to create dummy main() function in Keil?

Care explaining what will be the "dummy" character of this not-quite-main() function, and why you think you need something like that?

__main is different function, it unpacks the statics and later calls main

I want to update my firmware over the air.

So i want to try execute other function in the place of main().

And i want to try over write my code in internal flash via iap command. 

But my current running operation system execution was stop when i erase all flash for updating code.

I already received .hex file via uart and write into internal flash.

But i failed to update in the place of old firmware.

Please give me any suggestion how can update firmware??

Please explain me how can i create dummy main() with different name?

None of that will be helped in any way by changing the names of functions. 

Flash over-the-air means you will eventually have between two and three separate programs in the device: the currently running application, optionally a more-or-less complete new one in the process of loaded from the air, and a bootloader that decides which of the other two is which.  For that to work, you need some assistance from the hardware (vector table base switching, and/or a full MMU).  It may require building the code with position independency features for that.

See Broeker's reply - you really do not  need to do that! It is pointless!

http://www.catb.org/esr/faqs/smart-questions.html#goal

Md.Nasir said:

I want to update my firmware over the air

So have you looked at how others do that?

It is a very common requirement indeed - there are plenty of examples on the interwebs.

Almost certainly, NXP themselves will have an example.

The lpc1768 was the very first MCU for mbed - so there will be solutions there.

Google "lpc1768 bootloader" and "lpc1768 firmware update", etc ...