Important notice concerning Ridge Racer 3D and firmware update

 If you have Ridge Racer 3D , I recommend you not to update your 3Ds firmware. Nintendo will release a new firmware update later this month, to fix that bug.

Here is what Nintendo said about the Ridge Racer 3D freeze:

Accompanying the system update available on June 6, it has been confirmed that under certain circumstances when making a selection before the race starts in "Grand Prix" in "Single Play" mode of the Ridge Racer 3D game, the screen sometimes freezes. If you do not install the system update at this time, the symptom will not occur.

We apologize for any inconvenience. We will have a system update in mid-June that should take care of this matter.

In Ridge Racer 3D, pressing the B Button to return from Race Selection or Machine Selection may cause the screen to freeze. If the screen does freeze, please press and hold the Power button and turn the system off then retry. There should be no impact to the save data.

source: Nintendo