Try JCV in: sd:\Garmin\JCV folder , ASR in :sd\Garmin\ASR Folder etc
I have a JCV in sd and it works fine.
Everything is in internal mem. in .System should work in sd in Garmin folder, even multiple maps with anyname.img or gmapsupp.img in newer firmwares 34xx 35xx.
I moved my CNE in sd\Garmin named gmapprom.img and works