With thin Tetrarch build rewind doesn’t work.
While it is the text displayed “rewind” if you push the key, but it does not work.
With the build that’s with Retropie 2.6, rewind works fine. If you compiled retroarch itself it also works again.
There is also the problem since that build can not be displayed The framerate. I am sure that it worked with the Retroarch version that was there with Retropie 2.5. Even if you compiled Retroarch display framerate is not working. Retroarch crashes even complete, if you turn on the feature in the RGUI or adjusts the retroarch.cfg.