I have seen several requests for an easy to follow guide on how to Factory Restore a MyBookLive when the Dashboard is throwing errors and won't let you do anything, so here it is.
Please note that this guide will not delete any data on your data partition but you will need to follow the steps at the end of the guide to re-link your shares.
1) In a web-browser go to http://mybooklive/UI/ssh and you should see the following. Tick SSH Access Enable
2) If you are a Windows user, download PuTTY from http://the.earth.li/~sgtatham/putty/latest/x86/putty.exe
2a) If you are using a MAC, open Terminal and type ssh firstname.lastname@example.org and then hit enter and when asked,
enter welc0me for the password (Continue on to step 5)
3) Open PuTTY and enter mybooklive in the Host Name (or IP address) box and click Open
4) Now we need to enter the login information
type root for the username and hit enter
type welc0me for the password and hit enter
(The password text won't show up in the PuTTY window)
5) Now at the MyBookLive:~# prompt you are gonna type
wait a minute
and then type
6) Wait for your MyBookLive to reboot and when it does, go to the Dashboard and you should see
7) Factory restore complete and you should now have full dashboard access
If your shares are still listed in the MyBookLive dashboard but are not accessible, rename the shares and then rename them back to get them linked properly again.
EX. Movies > Movies1 > Movies
If your shares are missing in the MyBookLive dashboard, recreate them in the dashboard and you will be able to access your data again
A reboot is required to get the share and drive usage totals to reflect the actual data usage after these changes
Take a look at my other guides
How to open/unbrick/recover data/replace the hard drive on a bricked MyBookLive with no SSH access
Upgrade/Downgrade your MyBookLive firmware...Also contains a reset button script mod to restore Factory Fresh Firmware
Reset button script mod that also enables SSH access