Quoting image for reference:
First off, you need to tell us exactly which positions are already known so that valuable time is not wasted brute-forcing those positions. I see that you already have columns AA-AG and the big square at the top left, do you also know if any of the cleared squares around A9 are correct?
In your case you got 26 rows between 8 and 34, times another 26 columns between A and Z, which equals 676 different squares for you to check. In other words you're dealing with a search space of 2^676, even more enormous than the search space of bitcoin private keys.
There are some properties of QR codes that can reduce this problem size somewhat but it's still going to be too large for brute forcing.
Also, the problem solved in the freecodecamp article is fundamentally different from yours; They had a blurred QR code which they had to "unblur", but you seem to only have a fourth of your QR code and the rest of it is completely missing. The solutions used there can't be applied here, unless you actually have a blurred or low-res AR code (in which case please post it here).
Let's play a game - I'm offering 0.1BTC to whoever comes up with decoding software for my attached photo.
If you're serious about it, i would advice you to sign message with address which contain 0.1 BTC or use trusted escrow to attract people & edit title of this thread to attract of more people.
I agree, but how can I guarantee to also get the software?
Oh, so you want to hire someone then to write this software for you?

That's quite different from "playing a game" because in that case you'd definitely need a trusted escrow.
Well, it's a game, but I would like to see the code.
Any idea for a trusted escrow?
Guys in this quote chain, why make it like we have to privately send the code to OP, when it can just be uploaded to Github as a public proof and so that future people can benefit from it?
I see no benefit in spending a lot of energy making something only to hide it from the public. Just look at how many threads that exist here offering bounties to decode/decrypt/unscramble/brute-force their private key and imagine how many less threads like those would be made if the existing problems were solved and the code made available.
A9 is black, no information about the squares near it.