an138AN138 - Rev. 1.1 DMD20 Firmware ii DMD20 Firmware Upgrade Procedure AN138 - Record of Revisions Radyne ComStream, Inc. is constantly improving its products and thereforeThe Antonov An-38 is a stretched and upgraded version of Antonov's earlier An-28.It is a twin-engined turboprop transport aircraft, desned by the Antonov Desn Bureau in Kyiv,