SD card mount /overlay

I have an issue with my GL-MT1300. After upgrading to the latest version the router didn’t start from my sd card: I had my SD to root.

After a reset it works again now. But, I am not able to mount my 64GB SD to /overlay.

This is what you can see in block-mount via Luci:

Restart always restores this state. Even if I unmount /mnt/64GB.

Anyone who can help me here?

Use command

block info

to check any difference after the firmware upgrade.

And hotplug the script in folder

/etc/hotplug.d/block

may mount blocks unexpectedly.