In 2006, railbuses in Serbia were renovated at the Šinvoz factory in Zrenjanin (812/814 subseries 300), where the old Bussing U10 engine was replaced with a new Deutz BFM1013 engine. They were renamed to 814. The exterior and interior design were redesigned into a blue color with some red accents. The renovation was carried out by engineer Luka Čupković, and the redesign by Zorica Kljajić.