Hi Ramesh lyer,
1. Make sure the customer hardware works
If the hardware have problem, you can't connect it with the IDE.
So, I think you can use the JLINK debugger to test the customer board with SWD interface at first, use the JLINK commander check whether the ARM core can be found or not.
If you can find the core, it means the hardware works, you can download the code. Otherwise, we still need to check the customer KL03 hardware problem.
2. If the customer KL03 board have no connection problem. Then you also can use the JLINK to download the code in MCUXpresso at first. Just make sure it is not your P & E micro MultiLink ACP problem.
From the P&E website, I just find the USB MULTILINK and USB MULTILINK FX, I didn't used the P & E micro MultiLink ACP, please make sure this debugger can support the kinetis chip at first. If the JLINK also can debug the hello world, just your P & E micro MultiLink ACP have problem. I think it may relate to the debugger tool. If your JLINK also have problem, now we need to check the project.
1) clean the project
2) delete the following file, then build and download it again:
The following is my multlink universal download information
You must make sure your multilink SWD interface is connect correctly to the customer's KL03 board.
Wish it helps you.
Have a great day,
Kerry
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