Hello, I have a 2005 525. I had the auxillary cable installed. To complete that process, a software update was required. Before the update, my blinkers worked great! They would turn off as one would expect after completing a turn. Now, after the update, the turn signals stay on well after the completing a turn. Anyone know anything about this?
Thank you!

Do the stay on when activated in both direction?

Lol, whoa. I would just take it back to where you had the software updated (dealer?) and make them fix it.

Yes - both directions.