Sorry Aydan, but I'm out of ideas too. I used mdev in a bunch of embedded devices ( an iomega iconnect, an insignia infocast and a parrot df3120 photo frame ) and everything went smooth..
Could you paste here your mdev.conf (under /etc) ?
Are you using modules? Are installed in default path ( /lib/modules/`uname -r`/)? Can you run depmod -a in your kobo?. You can try if loading arco_*.ko and g_ether.ko modules before plugin usb cable makes any diference.
You can also build busybox yourself (cross-compile with kobo armhf toolchain) and disable features in mdev ( just enabling mdev itself )
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