"SoloBeast v1.1"-MW3 SP Trainer 1.9.461

[Lovroman]

Since Lovroman created this tool, I think he will be best fit to answer your question. @Lovroman

I don't know the answer, sorry .
I didn't do anything that changes XP's.
@NadeHouse Do you have any idea?

Non this ^ related question, why do you people download old version ?
Download file: SoloBeastv2.rar=>all features fixed and working .

[NadeHouse]

I don't know the answer, sorry .
I didn't do anything that changes XP's.
@NadeHouse Do you have any idea?

Non this ^ related question, why do you people download old version ?
Download file: SoloBeastv2.rar=>all features fixed and working .

I haven't played the game in a long time so I don't remember how these things worked, so I will try and respond with my knowledge that I remember.
Try to use the hack, complete the mission and check if your high score gets updated, that would mean it guaranteed it has saved. Perhaps you are cheating too much and there is something to detect this and the progress will not be saved.
Might be something along those lines.
Good luck @slysnake96