Thank you!

Learned alot about File Layout!

not too difficult not too easy , use hexedit and cyberchef

new things has been learned. bruXor costs a lot of time then suddenly a tool with only xor from "xor is your friend" which solves my problem in just 1.2 minutes lmao..

finally !!! its Hard ...

this one took a lot of work to solve, congrats

I've put those extra hex numbers (AFTER the first FF D9) into CyberChef and run the magic function in intensive mode but it doesn't find anything useful. Am I to enter a Crib into the magic box to help it as I've no idea what to add?

I don't use cyber chef so I can't help you.

hex editor and cyberchef's magic solved in 2 mins

+1 ...

That comment was useful, thanks! Cyberchef is really magic

Right, thanks!

Also you can use xortool instead of CyberChef ;)

What is that extra stuff after EOI ;)

Shhh... that is the flag, but it is in a binary format. Are there any clues in the challenge that might help with next steps?

finally !!! its Hard ...

this one took a lot of work to solve, congrats