I’m in a similar situation. I was able to extract the key but I seem to be having some issues with character encoding on one of the letters. I have a discernible flag in the “HBC{}” format but when i try to submit it I’m getting “Incorrect Flag”. I know it has something to do with this one ■■■■ character. If someone figured this one out, could you PM me. I’ve tried every variance of the character I could find to no avail.