Use this to determine what model:
How to identify MacBook Pro models - Apple Support
I doubt 9.1 was the previous OSX version . The latest iOS (iPhone, iPod touch and iPad) is 9.1
- Try starting in Safe Mode
OS X: What is Safe Boot, Safe Mode?
- Boot to Recovery and repair the startup disk
OS X: About OS X Recovery - Apple Support
- If it is repairable reinstall the OSX
How to reinstall OS X on your Mac - Apple Support
- If you do not have a backup use disk utility to restore the internal disk to an external disk so you can try to recover data.
Then format the startup disk and do a fresh install of OSX