Access file system on dead N810?

[chamois]

After installing some new applications, I rebooted my N810 and it stalls at the end of the Nokia screen with the progress bar complete. After staring at the blank screen for a while, I think some of the errors I got prior to rebooting might indicate that the new apps conflicted with my custom changes to /etc/sudoers.

So my question is. is there any way I can access the root file system to check/modify that file?

Otherwise I guess I am back to re-flashing the device.

Emilie