thanks Zach - now we see if my 'dead' v3b is still running upnp
And yes it is! So, how to implement a permanent mod....
Well, one option is to create a modified usb-storage.ko, as this would be loaded from /var/modules on boot. Maybe have it restart the kernel with a new command line changing the rootfs to the backup rootfs, then the thing won't die from the bootloader checking of the rootfs (maybe!
. Another route would be to try to create a subversive bt plugin, but it's not obvious if these would be loaded from /var/middleware or not.