I am using latest sxos (2.9.3beta) with FW9.1 on emunand.
1) Mouting .xci just works fine, but I can't mount splitted .xci (.xc0/.xc1/...). I am splitting the files because of fat32 sdcard, read about possibble corruption of exfat sdcards. Installing the same splitted .xci just works fine...