Here's me beating it, without cheats, on hard.
Step 1: Cheat Codes
If color letters are in () you need to hold these at the same time and strum i.e. (ry)if not just hold it and strum once
Enter these in the options menu.No fail doesnt work in solo career mode so you have to use it in quick play. After Hyperspeed is activated highlight it and press the green button until the number next to it says 5. All songs will not show up in the cheats screen but you will get a message that its on.
Step 2: Play It Like a Monkey!
Make sure your friends dont see you enter the cheats.After thats out of the way, go to quick play select expert diffculty, and go to bonus songs, then select "Through the Fire and Flames" by Dragonforce.
Your friends should all be around you saying no way he and/or she cant do this. (Dont worry you wont fail in the first 5 seconds, you have no fail on.) When it first starts, get a gorilla grip on the strum bar, and press those buttons and strum like Buckethead after 40 red bulls! its about 8 minutes long and youll probably need to take a break in the middle of it to rest your arms.After you finish the song, go get your clothes changed because youll be really sweaty if you Strum like I do.
Step 3: My Records
My current record for it on expert is:47%notes hit and an 30 note streakand points of 97000 i will try to update this whenever i get a better score