@CAP-33 This is like a DOS crosslink error on the FAT file system. To fix it you need to install the dosfstools. edit /etc/opkg/distfeeds.conf and uncomment line 1 opkg update opkg install dosfstools /usr/sbin/fsck.fat -f -l -a /dev/mmcblk0p1

Congratulations yourself

I get the solution ... I followed the steps of that video [https://www.youtube.com/watch?v=d1UbEg9kf5c](link url) but at the end I add one step ... I execute that command mount /dev/mmcblkop1 /overlay ... and then reboot. That was the only way to configure the microSD card. Thanks for your help

@Daniel-Bachmann Whats the best filesystem for the MicroSD in my omega 2+? ext4? FAT32? If your usage is linux only, I'd suggest ext4, however for portability across systems, stick with fat32. Whats the command to format the sd card from the command line? For ext4, first identify the device name and current mount point of the sd card, then: umount /dev/YOURDEVICE mkfs.ext4 /dev/YOURDEVICE mount /dev/YOURDEVICE /PREVIOUSMOUNTPOINT You may have to install some packages to get the mkfs tools. Refer to What is OPKG? for that. For fat32, I'd suggest you locate a tool called 'SD Card Formatter'. It's a windows gui tool, perhaps there are linux ports, I'm not certain.

@Santeri-Kaskela https://docs.onion.io/omega2-docs/boot-from-external-storage.html is what you need