This unit displays UPGRADE DISC, no functions operate. I need firmware from (Victor JVC) to upgrade unit. Upgrade data Please get it from js net web site for technological material of AVsystem. http://cs.jvc-vtb.co.jp ( MX-DK series Firmware Update Procedure ) * Unzip the data file (double clic the zipped file), and the data file for procedure * Write the data file for update in CD-R in ISO9660 format with "disc at once" There are total 4 models in the attached files, choose the correct software when copy for upgrading. Do not copy folder but only the 2 files in it.