Repair corrupt root filesystem on emmc

[Tozzi]

I need to bring this up again, as I find myself in the same situation.
I need to fsck my root partition on emmc (/dev/mmcblk0p7), tried all the recommended methods like:

• sudo touch /forcefsck
  
• adding fsck.mode=force and fsck.repair=yes to kernel cmdline
  

But none of this worked. tune2fs still reports the last check to have taken place 2 months ago.
File system (ext4) is still dirty and showing 6 gb of free space instead of 56.

Do I really have to open the NAS case, remove the emmc and fsck it on another machine?
Please tell me that's not true...

Using latest stable OMV build (aarch64).