By reading the title, you must have guessed something. Yes, you are right. It is so funny to find a wrong iOS version that shows up in Software Update. This happens particularly when Apple rolls out a new software update for its consumers. When you check for the update, you find the older version instead of the latest one.
But don't panic; there is an easy solution to this problem. If you haven't encountered this issue, you are lucky, because there are many iOS users suffering this problem.
Many users have experienced this problem when Apple launched Software Update iOS 9.0.1. However, you can fix this issue by following below-mentioned information.
Fix iOS Software Update Showing the Wrong/Old Version as Available
Step #1. Launch Settings app on your iDevice → Tap on General.
Step #2. Tap on Storage & iCloud Usage.
Step #3. Now tap on Manage Storage under the STORAGE section.
Step #4. Check the list of apps and find “iOS Software Update” (This app has icon similar to that of Settings). If you don't find this iOS Update, jump to Step #7.
Step #5. Tap on “Delete Update”.
Step #6. A menu will swipe up at bottom; confirm by Tapping on Delete App.
Step #7. Swipe up the Control Center and switch on Airplane Mode.
Step #8. Turn off Airplane Mode after 5 seconds and swipe down Control Center.
Step #9. Quit the Settings app by using app switcher. Double press the home button and swipe up the Settings screen.
Step #10. Open Settings app again → Tap on General.
Step #11. Tap on Software Update.
Now you can see a proper software update on your iDevice. The device will show correct iOS update for download and installation.