If your X300 DP PLUS Menu for Mileage correction or Immo can not see, here is the way to solve this problem:
1.Enter Home button, choose 【ES File Explore】
2. Click 【Home】， and then click【DP】
3. After enter the DP menu, choose the SN No. file 9514XXXXXXXX–FUNCTION–MILEAGE,
At the buttom of this file, there will be a 【en.cfg】, find and delete it.
4. Re-start the device
5. Enter 【upgrade】menu, then choose any of mileage correction software, download it.
Done !