Hi qaqarox, welcome to the Community. This type of modifications are not supported, but maybe some of the other users can share some advice. You can also check the following links:
http://community.wd.com/t5/WD-My-Cloud/How-to-unbrick-a-totally-dead-WD-My-Cloud/m-p/632129#M2347
If you are unable to recover your files you can contact any of the data recovery partners on the WD support page.