Please install JJ OS-XL in MPC2500.
Next, please start JJ OS-XL.
After JJ OS-XL starts, please press the [MODE] key and hit PAD3.
Product ID is displayed on a screen.
(Explanation site)
 
When Product ID is 7 characters, please click here
(The user who installed OS-XL in MPC into which the password of OS1 is not entered)
 
 
When Product ID is 5 characters, please click here
(The user who installed OS-XL in MPC into which the password of OS1 is entered)