Whilst iOS 9 has had a fast uptake from users some people are no doubt regretting the choice especially on older devices however, thanks to the Developer of OdysseusOTA some users can downgrade to iOS 8.4.1. 

OdysseusOTA, is a command line tool that allowed users to downgrade the iPhone 4s and iPad 2 from iOS 8.x.x to iOS 6.1.3, and now the developer has released a new version of his tool called OdysseusOTA 2.

OdysseusOTA 2 allows users to downgrade their devices if they have the iPhone 4S, iPhone 5, iPhone 5c, iPad 2 and 3 to iOS 8.4.1. 

OdysseusOTA 2 also allows users of the above devices to upgrade from iOS 7.x.x to iOS 8.4.1 instead of upgrading to the latest version of iOS 9.

You can download the OdysseusOTA 2 tool from here