I have a mvh 290 pioneer stereo in my car and I connect it every day wnd works fine but today for some reason it wouldn t

I tried some things that I looked up online and it doesn't seem to help. It identifies my device but then my iphone says it is unable to connect. Any help would be appreciated!

That's usually how it goes, things work - until they don't.

Try going through the manual: https://www.carid.com/images/pioneer/stereos/pdf/mvh290bt-user-manual.pdf

If that doesn't work, contact the manufacturer and see if they know of any issues.