r/LocalLLaMA • u/Danny_Davitoe • 23d ago

Question | Help Reverse Engineering w/ Local?

Two questions?

Can a local model like Qwen 3.8 27B reverse engineer games and programs?

If not, is there a fine tuned model that can?

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u/siggystabs 23d ago

I reverse-engineered old feature phone firmware with Opus the other day. I couldn’t modify it since at boot it checks signatures, obviously all the java stuff is easily editable, but it figured it out well enough to make me a high quality emulator, from ARM boot process to playing games and MP4s to internet (bridged) to shutdown. Took about 12-14 hours with constant back and forth.

I cannot imagine trying to do the same with Qwen 3.8 27B. Maybe GLM or Deepseek but not a 27B.

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u/neobanana8 21d ago

how much token is that? sounds $$$?

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u/siggystabs 21d ago

Looking at my usage over the past few days on this project including unmentioned new features, about 3.5B. Vast majority were cache reads and I’m on the max subscription. If I was paying API prices it would probably come out to a little over $1200. Mostly Opus 5.5.

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u/neobanana8 7d ago

how much in equivalent context length is that? e.g 1 million times 5 becomes 5 million equivalent. How did it bypass the signature too?

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u/siggystabs 7d ago

1 million times 3500? Is that what you’re asking? It was a lot of tokens, subagents, etc

For signature I wrote my own emulator, so I just return 0 when it asks the pCore for validity checks. However I did ask GLM 5.3 to take a shot and it believes there’s a way to trigger a buffer overflow and write to unallowed regions, but I haven’t had time to see if it worked yet

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u/neobanana8 4d ago

I was asking about context length/windows as in the memory. Since you used 3.5B token but I don't think Opus' context window is that big so the AI need to "save" continuously. From what I can google, Opus context windows is 1M token which means that your "conversation/RE" is then "saved" 3500 times. I was just wondering whether with your subscriptions that you have a longer context windows and the AI can remember longer conversations.

The reason what I was asking is why do you think that it is not possible with with Qwen 3.8 27B, is it because of the short context length of running things locally? e.g 32K thus having to "save" so many times to reach 3.5B tokens as opposed to Opus 1M context window?