Thank's @DaNail Coulthard for your Articles. I'm also started with Hacker101.
It's a pleasure to read your experiences with the course.
I even stuck on Flag 1, but with a little help from the Community I solved it in Burp Suite.
You can do it as following: Start a Request to the "edit"-Page and send the request to the "repeater". Be aware, that you have no cookies in your firefox from a current or previous login! (⇐ Thats was the Magic-Point for me!... if you have a cookie in your Headers, you got a "Bad Request"-Result).
In RAW or Headers-Tab change GET with POST. Then you got your Flag.
Thanks for this different approaches to the v1 and v2 flags.
Great to learn more options of way to get flags
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