Thanks help me from losting my treasured N810. It took a long way from Europe to China.

My device is in an endless reboot loop after power-on. It can be shut down only by removing the battery.

N810, OS2008, standard software and some Maemon applications.

Last night, I tried to connect N810 with PC by Bluetooth. I want to make this connection for web browsing.
1. I donwloaded the bluez-utils package from http://packages.debian.org/unstable/admin/bluez-utils, bluez-utils_3.36-2_armel.deb.
2. sudo gainroot
3. dpkg -i bluez-utils_3.36-2_armel.deb.
4. hcitool scan
00:01:02:03:04:05 (only example, )
5. hcitool cc 00:01:02:03:04:05

After that, I want to connect PC with my N810 by "Network Access". But this failed. Because N810 can only provide "BT earphone" service.

Now, I have open the BT connection, but all options, like "visible on" will be cleared automatically.

I powered off N810, then reboot. After desktop appears for 2-3 seconds, the N810 will be rebooted automatically. This is an endless reboot loop.

I connect USB cable for updating firmware, but it falied, because only 2-3 seconds are left for PC USB to idendify the N810. It will be rebooted soon. "Nokia Internet Tablet Software Update Wizard" can not find the N810 for refreshing firmware.

Can a system software error make N810 bricking?
Is there some solution to format N810? ( I have read the Nokia website Q&A, there is method of formatting, but i don't understand this method.)
http://europe.nokia.com/A4577229#faq45

The last chance, when the device is manufactured, it will be installed OS and application in factory bench. It is possible to refresh firmware in a lab bench. For example, "Nokia Customer Service Center" in Beijing can refresh the "died" N71, N81, N95... But in Beijing, N810 can not get the official support. The lab beach for N810 is the same with other Nseries?

Don't try installing packages from Debian is the lesson to learn here.

To recover, first of all try this (on your Linux machine):

sudo flasher-3.0 --set-rd-flags=no-lifeguard-reset -R

(see here for more details: http://wiki.maemo.org/Flasher)

Pull the battery of the N810, then stick it back in, then attach the USB cable (all the while the command above will be waiting and watching usb), then attach the AC power adaptor and the N810 will boot. It should then be found by the flasher and the no-lifeguard-reset flag will be set and it will then reboot.

You may then be able to restart the n810 without it continually resetting itself. If you can do this, remove the package you installed and re-install the one that is in the repo (i.e. just do apt-get install bluez-utils).

You can then remove the lifeguard-reset-flags (see the flasher documentation above) and start using your N810 again.

If this doesn't work, you'll have to reflash the device, using the standard instructions.

Out of interest why did you want to replace the installed version of bluez-utils with one from Debain?

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.

I meant why install another version when there's already one installed, unless support for these things has been added in a later version?

I need the command of "hcitool" in bulez-utils package. The original bluez version have no this command.

It's in this package for maemo: http://repository.maemo.org/pool/dia...sso4_armel.deb