in some cases you may have to toggle back off and on (takes .2 seconds).
Otherwise I have no suggestions.
f1 failed means you aren't properly setting up the trainer to bypass the game's anticheat.
the instructions are with the trainer, and it's too long to go over everything that people likely already posted here so the best suggestion is to read the forum here.
The trainer works and is up to date.
Verify your files for the game. Run it once without the trainer to make sure it runs. Close it, then follow the instructions with the trainer and here to run the game and attach the trainer.
With those files the Anticheat can be disabled. There are two methods avaliable (or at least was because don‘t know if both still work), the NO-BE Files and the launcher, you can use either of them so just use the launcher as described in the readme and follow the steps displayed/described and forget about the other files.
NO-BE stands for „No BattleEye“ (BattleEye is the Anticheat thats used by GRB)