gd87 unlock problem

[jak2812]

hi
i have one gd87 that when i want to read the codes with the panasonic code reader, the program detect the phone and read imei but not give me the codes.
i have used the program and the cable with other phones without problems
can anybody helps me?
thanks

[ahib]

you probly got new version set-crack 2d only does old versions -new versions you got to downgrade flash(not 4 beginners) unlock with 2d then upgrade flash again!

[jak2812]

you probly got new version set-crack 2d only does old versions -new versions you got to downgrade flash(not 4 beginners) unlock with 2d then upgrade flash again!

can you explain me how to downgrade with winmodo?
is good for that the same cable that i use for unlocking?, i bought the cable for unlocking and flashing
thanks