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What may be the reason for improper hex file generation.?

Hi All

         I have migrated the project of around 20 years old which was created using uvision2 (compiler :-Keil C51 Ver 6.2x) to Keil uVison5.

I am able to successfully build the project but the hex file generated is of only 6kb where the hex file created by the uVision2 is of 181kb.

I am using Keil uVision5 in trial version but I am not getting any messages saying build or compilation is restricted due to trail version.

Then I tried to flash the hex file to micro controller but it doesn't work.

What may be the reason for improper hex file generation.??