It works 100% on NAGC
If you are having trouble with unlocking the file try using KD, the instructions for KD is listed on the first page...
1. Activate hack located in your Grand Chase folder.
2. hit activate.
3. select NAGC
4. hit Patcher
5. when game-guard pops up hit activate
6. when login screen appears use unlocker/KD to close handle AI.kom
7. hit deactivate then login to the game.
8. i do this and i find it helps but apparently you don't have to, but change servers twice, enter a pvp screen and then go to the dungeon map tab and start playing from there. (i had less trouble once doing all this with getting it detected or anything stupid like random crashes).
9. enter stage you want to play (some maps have trouble with this like fang gang and one of the castle stages upon finishing the bosses deactivating causes crash... if anyone knows how to fix this for these maps please pm me)
10. hit start then select the hack window. watch the loading bar, it should go 11% 16% and then jump to 95% before loading, you will have about a 3-5sec range to hit activate. when 95% shows on the loading bar hit activate.
11. collect loot from first floor. wait 1min and then continue the run to the boss (should be about 130 when you finish a floor this way).
12. when the boss dies wait either 20sec or till your pets attack gauge to hit 40-50% and then deactivate hack, then hit X to skip text, collect the loot and wait for level to complete.
then repeat steps 8-12 as needed, once you get into the pattern its really easy to do... if you are trying to level try skipping levels that have bosses with multiple boss forms as the timing for these are more annoying to get, find a nice stage around your level and run it till you get a few levels and can challenge a better stage.
ps. page 140 lists an easy way to do the hero dungeons so go look there for those.