unable to add nus service to DFU example.

I am using softdevice132, sdk 14.0, pca10040 dk, when i add nus service to the dfu example, it is not working. there were also some warning about iram start address, which i changed accordingly in the linker file and nrf_sdh_ble.c

MEMORY { FLASH (rx) : ORIGIN = 0x23000, LENGTH = 0x55000 RAM (rwx) : ORIGIN = 0x20002100, LENGTH = 0xFFF0 }

in nrf_sdh_ble #define RAM_START 0x20002100

i have also changed the vs_uuid count to 2. the log messages are enabled, but now nothing is showing on my terminal :(

LED 3 is continuously glowing. should i change gatts attribute table? or is there anything else that i am missing?