I can flash in nRF51822-EK but it's not working

Question

I use mac os x sierra on MacBook pro 2016. And I followed this link . 
 I took following things in order. 
 
 
 I moved gcc-arm-none-eabi-5_4-2016q3 to /usr/local/gcc-arm-none-eabi-5_4-2016q3 
 
 
 I moved nRF51_SDK_10.0.0_dc26b5e to ~/Library/Nordic/nRF51_SDK_10.0.0_dc26b5e 
 
 
 I moved s110_nrf51_8.0.0 to ~/Library/Nordic/s110_nrf51_8.0.0 
 
 
 I edited ~/Library/Nordic/nRF51_SDK_10.0.0_dc26b5e/components/toolchain/gcc/Makefile.posix like this. 
 GNU_INSTALL_ROOT := /usr/local/gcc-arm-none-eabi-5_4-2016q3 
 GNU_VERSION := 5.4.3 
 GNU_PREFIX := arm-none-eabi
 
 
 
 I went to ~/Library/Nordic/nRF51_SDK_10.0.0_dc26b5e/examples/peripheral/blinky/pca10028/blank/armgcc . And I compiled by make all . After comiplation I got this messages. 
 rm -rf _build
 rm -rf _build/*.o
 echo Makefile
 Makefile
 mkdir _build
 Compiling file: system_nrf51.c
 Compiling file: main.c
 Compiling file: nrf_delay.c
 Compiling file: gcc_startup_nrf51.s
 Linking target: nrf51422_xxac.out
 Preparing: nrf51422_xxac.bin
 Preparing: nrf51422_xxac.hex
 
 text data bss dec hex	filename
 988 104 28 1120 460	_build/nrf51422_xxac.out
 
 
 
 I typed JLinkExe -device nrf51822_xxaa -if swd -speed 4000 . I got this messages. (I removed S/N) 
 SEGGER J-Link Commander V6.14b (Compiled Mar 9 2017 08:48:44)
 DLL version V6.14b, compiled Mar 9 2017 08:48:31
 
 Connecting to J-Link via USB...O.K.
 Firmware: J-Link V10 compiled Jan 9 2017 17:48:51
 Hardware version: V10.10
 S/N: ********
 License(s): GDB
 VTref = 2.576V

 
 Type "connect" to establish a target connection, '?' for help
 J-Link>
 
 
 
 I typed erase , I got this messages. 
 Target connection not established yet but required for command.
 Device "NRF51822_XXAA" selected.
 
 
 Found SWD-DP with ID 0x0BB11477
 AP-IDR: 0x04770021, Type: AHB-AP
 AHB-AP ROM: 0xF0000000 (Base addr. of first ROM table)
 Found Cortex-M0 r0p0, Little endian.
 FPUnit: 4 code (BP) slots and 0 literal slots
 CoreSight components:
 ROMTbl 0 @ F0000000
 ROMTbl 0 [0]: F00FF000, CID: B105100D, PID: 000BB471 ROM Table
 ROMTbl 1 @ E00FF000
 ROMTbl 1 [0]: FFF0F000, CID: B105E00D, PID: 000BB008 SCS
 ROMTbl 1 [1]: FFF02000, CID: B105E00D, PID: 000BB00A DWT
 ROMTbl 1 [2]: FFF03000, CID: B105E00D, PID: 000BB00B FPB
 ROMTbl 0 [1]: 00002000, CID: B105900D, PID: 000BB9A3 ???
 Cortex-M0 identified.
 Erasing device (nRF51822_xxAA)...
 Comparing flash [100%] Done.
 Erasing flash [100%] Done.
 Verifying flash [100%] Done.
 J-Link: Flash download: Total time needed: 5.406s (Prepare: 0.016s, Compare: 0.000s, Erase: 5.387s, Program: 0.000s, Verify: 0.000s, Restore: 0.002s)
 Erasing done.
 
 
 
 I typed loadbin _build/nrf51422_xxac.hex 0 . I got this messages. 
 Downloading file [_build/nrf51422_xxac.hex]...
 Comparing flash [100%] Done.
 Erasing flash [100%] Done.
 Programming flash [100%] Done.
 Verifying flash [100%] Done.
 J-Link: Flash download: Flash programming performed for 1 range (2048 bytes)
 J-Link: Flash download: Total time needed: 0.181s (Prepare: 0.034s, Compare: 0.089s, Erase: 0.021s, Program: 0.012s, Verify: 0.000s, Restore: 0.022s)
 
 
 
 Finally I typed r , g , exit in order. 
 
 
 But the LEDs in nRF51822-ek were not blinking. What did I do wrong?