[SOLVED] /dev/root is fully used 100% - What?!

[inc0gnit0]

BusyBox v1.30.1 () built-in shell (ash)

  _______                     ________        __
 |       |.-----.-----.-----.|  |  |  |.----.|  |_
 |   -   ||  _  |  -__|     ||  |  |  ||   _||   _|
 |_______||   __|_____|__|__||________||__|  |____|
          |__| W I R E L E S S   F R E E D O M
 -----------------------------------------------------
 OpenWrt 19.07.1, r10911-c155900f66
 -----------------------------------------------------
root@OpenWrt:~# df
Filesystem           1K-blocks      Used Available Use% Mounted on
/dev/root                 2816      2816         0 100% /rom
tmpfs                    62260       296     61964   0% /tmp
/dev/mtdblock9           11008       440     10568   4% /overlay
overlayfs:/overlay       11008       440     10568   4% /
tmpfs                      512         0       512   0% /dev

I use this device ... and there is plenty of memory!

Any ideas what is going here?? Thank you for help!

[fantom-x]

@inc0gnit0

/dev/root 2816 2816 0 100% /rom

That is a r/o mount with all the files. It is normal to have no free space. New files will be written to /.