Don't use mechanical methods of taking out the disk...... you did not tried everything to use this method ;-)

So do the following:

Before doing everything find and download navi softvare created in Mode2/Form1 (you can check this by opening the image of navi SW in any program which is able to work with images, I prefer ImgBurn for this). Having this image burn it on the slowest speed (1x is preferrable, 2x maximum) to the disk, make the error check.

1. Open the trunk, switch the ignition OFF, close all the doors
2. Wait till the LED on your navi goes off
3. Take out the navi unit (for this press four fixing nails - two on each side of the navi and take navi out)
4. Disconnect two joints (blue and brown) fron the back side of the navi
5. Wait for 15-20 minutes
6. Connect cables back
(items 3-6 could be replaced by disconnection of the batery)
7. Switch an ignition ON
8. Press continiously Eject button, in certain time jamed disk should come out
9. Put the SW disk into navi unit
8. "Pray" (c) KiwiJochen ;-)

It could take a little bit more time than in normal situation (approx 10-15 min) when the update process will come on the screen.

Good luck

Then tell us the results....