When you boot and leave the USB cable connected, the device will export all partitions for the external computer.
If you are using a Windows machine, you only get access to MyDocs, but that might be enough.
@OP
What you want to do is what Nieldk posted in his answer, but instead, at the flashing step, do just flasher -f main.bin -> Don't do the emmc.bin part because that will erase all your data
now it just hangs at the boot screen (nokia logo) and there's no usb logo in the corner
When you boot and leave the USB cable connected, the device will export all partitions for the external computer.
If you are using a Windows machine, you only get access to MyDocs, but that might be enough.