"Checksum doesn't match" error on Apple M1/M2/M3

[muffintop98]

Running snap camera server on MacOS 14.1
I have applied the patch to my Snap Camera app, however, when trying to use a lens like "My New Twin", the lens just "spins" after I select it.

In the Snap Camera log, there is an error:
"Checksum doesn't match for lens archive: 60928810985", and I noticed the lens also does NOT appear in my /Snap Camera/Lenses directory.

Any ideas on how to fix?
Thank you!

[ptrumpis]

Looks like the patch was not applied. Something went wrong.
I would suggest to re-apply.

You can upload your binary to MD5 File Checksum and compare it to the values below.

MD5 checksums of macOS binary

• Original (Codesigned)
  8dc456e29478a0cdfaedefac282958e7
• Original (No Codesign)
  15ad19c477d5d246358d68a711e29a6e
• Patched (Codesigned)
  1ac420d1828a3d754e99793af098f830
• Patched (No Codesign)
  e2ed1f2e502617392060270fa6e5e979

[ptrumpis]

Please upload the file /Applications/Snap Camera.app/Contents/MacOS/Snap Camera to
https://emn178.github.io/online-tools/md5_checksum.html

What value do you get?

[dbacks2196]

Thanks for replying so quickly! Sorry I am just answering now. I get 1765b2647b5d65d470fb104d4a0afdc8. This is the same value I've gotten every time I've applied the signature patch to the executable, but I don't remember seeing it as one of the values other people have gotten.

[akh925]

I am also having this issue. I've gone through setup successfully multiple times using an Intel Mac Pre Sonoma. I switched to an M3 Yesterday. I followed all of the setup steps (Including applying the patch, replacing the binary, and running errorfix.sh). Unfortunately, I'm also seeing the exact behavior mentioned above. When activating a lens, I receive a checksum error in logs, and the lens has an infinite spinning/loading icon in the snap camera app and never activates.

[akh925]

I finally got this working. I don't know the exact cause but it definitely seems to be a conflict with Mac OS 14/Apple Silicon

Steps to resolve:

1. Patch Binary
2. Make Binary executable
3. Resign App signature sudo codesign --force --deep --sign - "/Applications/Snap Camera.app" (You may need to unsign first, I didn't)
   -NOTE: Make sure your Terminal has full disk access, Patrick walks you through how to do that in the Mac video
4. Right-click the Snap Camera application (not the binary)-> Get Info -> Make sure "Open Using Rosetta" is toggled on

After following the steps above, I no longer get the checksum error and my lenses activate properly.

[ptrumpis]

You need to read and follow these steps if you want assistance.
I can't help without the output of errorfix.sh

1. Make sure to have a fresh installation without any previous patches applied, uninstall and re-install if necessary
2. Original files with original MD5 checksums can be found here: Download Snap Camera.
3. Docker Server needs to be up and running, you can verify in your browser if https://studio-app.snapchat.com/ is reachable
4. Patch your binary with Patch Tool, you need to see a green CRC checkmark and no error message during patching.
5. Download and replace the binary after patching (watch the video guide if you are not sure how)
6. Now download and run macOS errorfix.sh inside your Terminal, you don't have to manually execute any other command.
7. Report the output here

[akh925]

I posted a workaround. I think the missing step is enabling "Open Using Rosetta" to emulate the intel architecture.

[ptrumpis]

Thank you, would be nice to hear verification from @muffintop98 and @dbacks2196

[dbacks2196]

Thanks for the instructions, @ptrumpis! And WOW, @akh925! You rock! I can't believe the solution was so simple. Everything works perfectly under Rosetta. Thank you so much.

@ptrumpis, you've truly done an amazing job helping to keep Snap Camera preserved for everyone via local servers. Do you foresee a way in the future that will allow this solution to run without these limitations with Snap Camera's ARM binary? I'm just wondering how we'll be able to do this once Apple deprecates Rosetta 2.

Also, everything's working, but feel free to let me know if you'd still like Terminal output from your shell script.

[ptrumpis]

Thank you for your feedback!

Also, everything's working, but feel free to let me know if you'd still like Terminal output from your shell script.

If everything works, I don't need it.
(The script now includes an update that attempts to open Snap Camera on ARM systems with Rosetta as suggested)

Do you foresee a way in the future that will allow this solution to run without these limitations with Snap Camera's ARM binary?

I will take a look into it.

[dbacks2196]

Thank YOU! And awesome.