1) To update your dashboard, you need to flash it back to stock. When it's stock, update your dashboard and then flash it to LT 2.0
2) If you still have the dummy.bin file, you don't need a probe. The only problem that might occur is that your pc motherboard doesn't recognize the drive very well (You'll get an 0x51 error when trying to erase your drive, that was my problem. I tried another pc and it worked!). In that case try another pc or buy a VIA card.
If you can't find your dummy.bin, you can try to extract it using the tutorial in the official jungleflasher tutorial (page 94) Jungle Flasher - Downloads
Follow this tutorial: Flashing a LiteOn Drive - For Noobs. This worked very well for me!