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You go to the K2500 section of Kurzweil's site:
http://kurzweil.com/product/k2500r/downloads/ http://kurzweil.com/product/k2500r/downloads/
... and download the OS for your unit (with or without KDFX) as well as the object files for the ROMs you have. If you don't have one of those floppy emulators, you'll need a USB 3.5" floppy drive and some 1.44MB DOS-formatted 3.5" diskettes.
The installation procedure is in the "readme.txt" file for the OS disk:
If upgrading from a version previous to version 5.0, it also requires the installation of the version 5.0 Base Objects. (It is also possible to use version 4.90, which is an identical file, with only a version number difference.) The v4.03 Objects files for the Options (ROM blocks and Live Mode) would also be reinstalled, if they are appropriate for your instrument. You can download these files from the Downloads page on our web site - http://www.kurzweilmusicsystems.com.
The complete procedure for installing the operating system is included in Chapter 2 of the K2500 Performance Guide. For your convenience, here's a summary of the procedure:
1. Copy the file K25V501.KOS onto a DOS formatted floppy.
2. Start the K2500
3. Press and release the Exit key while the "Please wait..." message is displayed. This brings up the K2500 Boot Loader.
4. Insert the operating system floppy, then use "Install System" from the K2500 Boot Loader to install the new operating system.
5. As mentioned at the top of this document, a new Object file will need to be installed (and the other object files reinstalled). Please see the README file included in the file K25_BASE_OBJECTS.ZIP for details.
6. When the installation is finished, choose "Run System" from the Boot Loader.
While you won't normally need to reinstall the operating system, you should still put the disk in a safe place, just in case you may need it again.
Note: you can also install these files from a DOS or Kurzweil formatted SCSI disk. When the display asks which device you want to install from, change the parameter to the appropriate SCSI ID. You can only install files from a SCSI disk which is 1 gig or smaller.
We recommend performing a hard reset after installing and running the new system. Choose the Reset soft button from the Master page.