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Difference between Router vs Router-SBL in terms of bootloader

Other Parts Discussed in Thread: Z-STACK

I am using Z-stack mesh's genericApp on a custom board (copy of CC2538EM). When I load "Router-SBL" (or coordinator, enddevice), the program gets stuck on the ROM area. However, if I use "Router" code, then the program flows till MAC timer wakeup function. 

What is the difference between two program in terms of bootloader so that one can't even start up, the other one is able to flow up to some point?

P.S. I don't use any of Port A pins, they are all unconnected