AltJIT Failing with ConnectionError

[CooperCorona]

I'm trying to enable JIT on DolphiniOS. I followed the instructions, but I kept getting an error. I tried a variety of troubleshooting steps, which changed which error I got, but it did not change the error. I

• Installed openssl@3 using Homebrew.
• I ran python3 -m pip install pymobiledevice3==2.30.0 construct==2.10.69 qh3==0.15.1 according to Documentation on enabling JIT is outdated #1497. This fixed the "LibreSSL" error and the error from that issue.
• Installed DolphiniOS, and selected it in the AltServer > Enable JIT menu.

However, now I'm getting
The process 'altjit' failed with code 1. Could not connect to device 00008110-001838D90AEA401E. The process 'python3' returned unexpected output. ConnectionError

Full error at this Gist.

Some posts say to run the Python commands directly, but when I run python3 -m pymobiledevice3 remote start-quic-tunnel --script-mode, I get the same error. Furthermore, this seems to break the connection to my device. I can't run anything in Xcode, getting a "Waiting for iPad to connect", until I restart both devices.

Versions:

• MacOS Sequoia 15.2
• iPadOS 18.2
• iPad Mini 6th Gen

[CardiganDisaster]

Hello! I have been getting this same exact error whenever I try enabling AltJit for Dolphin iOS ever since I updated to iOS 18.2 on my iPhone as well! Were you ever able to figure out a fix?

I finally was forced to update from iOS 16 to iOS 18, which I knew would cause some issues but this one has me stuck. I've followed every guide possible and was getting an <Epoch.INITIAL: 0> error. That lead me to this thread #1345 (which was super helpful for all the other issues I had) and the same python3 -m pip install pymobiledevice3==2.30.0 construct==2.10.69 qh3==0.15.1 fix you mentioned.

I thought that was going to be the end of it, but now I'm stuck with the connection error :( any help would be appreciated!

My devices

• MacOS Sonoma 14.7.2
• iOS 18.2
• iPhone 14 Pro Max

[rmGFW]

I'm having a similar issue,

Error Description
The process 'altjit' failed with code 1. Could not connect to device 000xxxx0-000xxxxx1001C. The process 'python3' returned unexpected output. Error: No such command 'start-quic-tunnel'.

Failure Reason
The process 'altjit' failed with code 1. Could not connect to device 000xxxx0-000xxxxx1001C. The process 'python3' returned unexpected output. Error: No such command 'start-quic-tunnel'.

Title
JIT could not be enabled for UTM.

Source Line
61

executableURL
file:///Applications/AltServer.app/Contents/MacOS/altjit

exitCode
1

output
/Users/leo/Library/Python/3.9/lib/python/site-packages/urllib3/__init__.py:34: NotOpenSSLWarning: urllib3 v2.0 only supports OpenSSL 1.1.1+, currently the 'ssl' module is compiled with 'LibreSSL 2.8.3'. See: https://github.com/urllib3/urllib3/issues/3020
  warnings.warn(
Usage: python -m pymobiledevice3 remote [OPTIONS] COMMAND [ARGS]...
Try 'python -m pymobiledevice3 remote -h' for help.
Error: No such command 'start-quic-tunnel'.

❌ Unable to enable JIT for UTM on device 000xxxx0-000xxxxx1001C.
Could not connect to device 000xxxx0-000xxxxx1001C. The process 'python3' returned unexpected output. Error: No such command 'start-quic-tunnel'.

[jonreyno]

Also getting the same error as @CooperCorona and @CardiganDisaster after following the same steps to fix the other qh3 error.

Versions:

• MacOS Sequoia 15.2
• iOS 18.2
• iPhone 12 Pro Max

[doublegate]

Same here, as well. iOS 18.2.1, trying on both iPhone 15 Pro and iPad Pro (M4) using MacOS Sequoia and all available suggestions / fixes on GitHub and Reddit ... no-joy.

" ... The process 'altjit' failed with code 1. Could not connect to device 00008110-001838D90AEA401E. The process 'python3' returned unexpected output. ConnectionError ..."