Hello Salman sattar,
If you want to have two separate image stored in Pflash, you need to create the secondary bootloader to download and choose the according app code.
But, now we still don't have the secondary bootloader code for LPC5460X, so you need to create it by yourself.
After I search the website, I found a secondary bootloader for LPC54102, I think it may useful to you:
http://cache.nxp.com/docs/en/application-note/AN11610.zip?fsrch=1&sr=3&pageNum=1
Have a great day,
Kerry
-----------------------------------------------------------------------------------------------------------------------
Note: If this post answers your question, please click the Correct Answer button. Thank you!
-----------------------------------------------------------------------------------------------------------------------