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N900 upgrade with minimal work

http://tablets-dev.nokia.com/nokia_N900.php

backup your setting via backup tool
dpkg --get-selections > /home/user/MyDocs/installed

flash your n900

sudo flasher-3.5 -F RX-51_2009SE_1.2009.42-11_PR_COMBINED_MR0_ARM.bin -f -R

N900: While holding the u key, connect the N900 to your computer via USB. Wait until you see a dim screen on your N900 with a Nokia logo in the middle of your screen with an USB icon in the top right corner.

restore settings via backup tool
install rootsh
apt-get update
dpkg --set-selections < /home/user/MyDocs/installed apt-get -u dselect-upgrade

talk.maemo.org/showthread.php?t=47846

Sygic modification

So A2DP is causing sound policy problems and needs to be fixed. In the meantime, one can disable it by uncommenting and changing the "Disabled=" line in /etc/bluetooth/audio.conf to be:

Disable=Control,Source,Sink