These are the installation instructions for updating the firmware in a 4 Series MSO oscilloscope using your downloaded 4SeriesMSO firmware update zip file. Contents of this zip package: install.txt - this text file releaseNotes.txt - describes differences between firmware versions firmware.img - oscilloscope firmware file readable by 4 Series MSO Applicable open source licensing references. Instructions: 1. Unzip the 4SeriesMSO_v_1_24_9.zip file and copy the file 'firmware.img' to suitable USB media in the root or topmost folder. Most brands of USB flash drives and USB hard drives are suitable media. 2. Check to make sure there are no other files in that folder that have a file suffix of ".img". For example, there must not be any files named firmware.img. If you have multiple .img files, the oscilloscope may not load the correct one. 3. Power down the oscilloscope. 4. Insert the USB media into any of the USB Host ports on the front of the oscilloscope. (The host ports on the rear of the oscilloscope may also be used.) 5. Power on the oscilloscope. After a few seconds, the screen should display a message stating that the firmware upgrade procedure is in progress. Do not turn off the oscilloscope or remove the USB media until prompted to do so! 6. When the screen says that the upgrade is complete, turn off the oscilloscope. 7. Remove the USB media. 8. Turn on the oscilloscope. Currently Installed Version: The firmware version currently installed in the oscilloscope is shown in the About menu, accessible from the Utility menu. Troubleshooting: - If the firmware does not load, verify that the USB media is supported by the oscilloscope. Click the File menu and attempt to save a setup to the USB media. If you cannot save and recall .set files, the USB media may not be supported. Try another brand of USB media. If other brands do not work, try one of the other USB host ports on the oscilloscope. There are three host ports on the front and two on the back of the oscilloscope. - If the firmware does not load and the USB media otherwise works fine, then the firmware file may be corrupted. Try downloading the firmware again. - New versions of firmware are released from time to time. Visit www.tektronix.com/software. - If you are still unable to load the new firmware, please contact the Tektronix Technical Support Center. Customers calling within the U.S. call 1-800-833-9200 press 3. Worldwide, please visit www.tektronix.com to find contacts in your area.