asset_tracker does not work with firmware v1.0.0


- DK 0.8.2 in which SB44 is cut, and P1 and P2 are connected
- firmware v1.0.0
- program : asset_tracker
- SIM: iBasis

Before updating firmware, asset_tracker worked fine. 

However, after updating, LED3 is always blinking and LED4 is off.
What I do is to write the program to DK, push reset button, and wait for more than 5 min.
at_client program and LTE Link Monitor works out with v1.0.0.

this is log

SPM: NS image at 0xc000
SPM: NS MSP at 0x2002aa00
SPM: NS reset vector at 0x142f1
SPM: prepare to jump to Non-Secure image.
***** Booting Zephyr OS v1.14.99-ncs2-rc3 *****
Asset tracker started
Connecting to LTE network. This may take several minutes.
Connected to LTE network

Any idea to solve this?