sit tight for the next three weeks or so, as Nokia has stated that after this period the roll-out of the WP 7.8 update will be complete, and if you haven't received the update, to check with your network carrier or your local Nokia Care: http://nokia.com/support
The release of the update is still in progress. Like what jekiboi has said, the best action is still to wait for it.
The Windows Phone 7.8 update is now rolling out for Nokia Lumia smartphones through February. Delivery of the update is operator dependent, meaning you will receive a notification in the coming weeks if you have an unlocked phone or if your operator has approved the update. If you don’t receive the update notification within the next three weeks, please contact your operator for more information
You may be in Bulgaria, but it is possible that your phone is not a Bulgarian variant because it was imported from another country. Another possibility is you have a Bulgarian variant but it is an operator branded variant. Updates for operator branded phones have to be approved by the operator before release. You need to contact the operator regarding the approval.
Thank you
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