Upgrade --> No boot anymore

[Diako]

Software
XBian version: 1.0 RC3
XBMC/Kodi version: 13
Overclock settings: Xbian default (840 or something like this)

Hardware
Device type and model : Raspberry Pi Model B+
Power supply rating: 5V - 2A
SD card size and make/type: Sandisk Extreme Plus 16 GB
Network (Ethernet or wireless): Ethernet and Wifi usb dongle
Connected devices (TV, USB, network storage, ...): : TV (HDMI), Wifi dongle (USB), External HD (USB)

Log files
Link to logfile(s): No log

Problem description:
Yesterday i upgrade my Xbian by xbian-config (SSH connected) and after coming back a few hours later i saw upgrading was blocked in upgrading locales.
As i cannot stop upgrading or connect to the RPi with another SSH connection i disconnected the power supply and reconnected it.
Since the RPi do not boot anymore. I have the red light on but the green light blink twice and stop. The TV displays just a black screen without any thing writtent.
I followed this help : http://elinux.org/R-Pi_Troubleshooting#Red_power_LED_is_on.2C_green_LED_does_not_flash.2C_nothing_on​_display
I downloaded the bootcode.bin and with this bootcode the green light is on without blinking but on the screen is worst since i have a black screen for 1 second and then no more stream is received by the TV... Of course even with no screen the RPi doesn't boot and i cannot connect to it in SSH.

Since i have no backup and i don't want to reinstall xbian et lose all my configuration (xbmc, sickbeard, couchpotato,...) i would like to save my Xbian with your help please.

How to reproduce:
Be unlucky ?