All credits go to T2X. I just leeched it! After this u can hack back to any lvl u like.
Information about ranks;
The highest rank will save so if your are like Lv.30 and hack to Lv.70, Lv.70 will save.
If you are like Lv. 56 and hack to Lv. 34, It won't save as Lv.34, it will stay saved as Lv. 56 because the highest rank will save.
So if you want a lower rank; you can use this tutorial to reset your rank and hack to the Lv. you want.
This tutorial will reset everything so your titles, emblems, weapons, attachments, accolades, challenges and rank of course will be reset.
Well, here is the tutorial:
Do this when MW2 is NOT launched.
1. Go to:
and delete all .STAT files.
2. Then go to:
C/Program Files/Steam/Userdata/Some numbered folder/Some numbered folder/Remote
And delete the 2 files there
3. Then launch MW2 and play till you are lv.2 so it saves and you are done!