[PPI file] cannot load the PPI into keyboard

[Trannam9]

Dear all,
I've tried to install my PPI file into my keyboard as my child accidentally reset my sx900 to factory preset.
However, when i load the file again, the keyboard shows that, the file is not supported.
Is it for the reason that the PPI file was created when my keyboard runing on older firmware, and now, as i have recently updated firmware of my keyboard to V1.11, it cannot load again.
Thank you very much.