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Can you explain what the problem is when you write the contents of a file? Your descriptions have been vague.
Post the code you are using to write the file and the code you are using to read the...

What is 2 b?
Please use English.

There is no Java SE class: outputstream. Java is case sensitive and all classes start with a uppercase letter.

What is the name of the class you are using to write to the serial port with?
Does it have methods for writing bytes?

What class and what method are you using to send what you are sending?

What is a hex file? Does mean a non-text file that has bytes that can contain any of 256 values: 0x00 to 0xFF
If the file...

Do you have the code to send any file to a serial port?

What is a hex file? Does mean a non-text file that has bytes that can contain any of 256 values: 0x00 to 0xFF