I tried creating hex file using OH51-v2.6 from DOS prompt. This s the error msg i get. OBJECT TO HEX FILE CONVERTER OH51 V2.6 COPYRIGHT KEIL ELEKTRONIK GmbH 1991 - 2001 GENERATING INTEL HEX FILE: ledswitch.hex *** ERROR: UNKNOWN RECORD TYPE 0FH *** OH51 ABORTED. Please can any one help me through this process of hex generation.should i pass any agr. to OH51 along with the filename? Or where can i download a utility that converts .obj file to .hex file.