Germany canceled the liability to quarantine for arrivals from Bulgaria after presentation of a rescue certificate after coronavirus infection, immunization or negative CVID-19 test. The test can be submitted within 48 hours after entry into the country.
The relevant immunization or prejudice documents may be required by the competent authorities before the start of the journey. Certificates can be in German, English, Italian and Spanish, in digital or paper form, but not photographed.
An exception to the test and authentication obligation are children under the age of 6 as well as aircraft crews.
Remains the registration requirement in the electronic system - www.einreiseanmeldung.de.
With a technical problem with the site you can fill the so-called "Replacement Notification", which is also in Bulgarian: https://www.bundesgesundheitsministerium.de/fileadmin/dateien/3_downloads/c/coronavirus/infoblatt/2021/BULGARIEN.PDF