He then competed without reaching the final at the 2005 World Championships, the 2006 European Championships, the 2007 World Championships and the 2008 Olympic Games. He finished fifth at the 2006 IAAF World Cup and the 2008 World Indoor Championships. In the latter race he finally set a new indoor PB, 1:45.76 minutes, which still stands. Outdoors he had set several successive personal bests, year by year: 1:45.72 minutes in 2002 (July, Cuxhaven), 1:45.28 minutes in 2003 (June, Seville), 1:45.12 minutes in 2004 (June, Ratingen) and finally 1:44.33 minutes in 2006 (July, Athens). Bogdanov also holds the European indoor record in the 4 x 800 metres relay, with 7:15.77 minutes achieved in February 2008.