Thank you, I have followed your instruction to fix the endless reboot problem.
1. Why I install a new bluez-utils? In MS PPC system, I can connect internet by bluetooth. But the bluez protocol in N810, it can not support this feature. I do some try on it.
2. I want to connect N810 by BT, because the N810 can not support WiFi Cisco LEAP protocol. N810 only support EPA/WPA, but in my office, all networks are based on Cisco device and Cisco protocol.

It is better to support these two features in next version.
Thank you again.