https://retropie.org.uk/forum/topic/297/failed-failed-to-start-usbmount-dev-sda-service/2

@bamsi found a work around for same problem with my ps3 controller. I just manually configured retroarch settings in the retroarch menu. Watch video at link https://retropie.org.uk/forum/topic/100/made-some-progress-on-2-generic-shanwan-ps3-controllers-via-bluetooth-on-pi-3-retropie-3-6

I got it working with another bin + cue :)

Thanks everyone, I will experiment tonight with it!

try this..
config.txt settings

hdmi_group=1
hdmi_mode=6 or hdmi_mode=21

Even on PC, the 3DO emulators are very slow and buggy. In the end, for the games I have wanted to play, have found nearly all were released either for Dos or PSX. Games like Need For Speed, Return Fire, Fifa, etc.

guys any help?

I think it could possibly be caused by something wrong in your system retroarch.cfg or even global retroarch.cfg. I'm not sure exactly what lines would cause it to not look at the per-game .cfg file, but I know doing things in the Retroarch GUI and using save on exit can populate a huge .cfg file in either the system based or global config. So it may be worth trying to revert to the .rp-dist(should be stock) for global and system retroarch.cfg, and seeing if that fixes it.

I fixed it.

It was due to rpi-update i did after raspbian fresh installation.

I reinstalled raspbian but not updated firm and all seems to work now.

As is always the case, as soon as you ask you find the answer :)

per rom config is explained here : https://github.com/retropie/retropie-setup/wiki/retroarch-configuration