AltJIT Failing with ConnectionError

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 #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

Start by reproducing the failure from AltServer’s Enable JIT menu using the listed macOS, iPadOS, and device details. Compare it with the direct pymobiledevice3 remote start-quic-tunnel --script-mode command and review the full Gist and issue #1497. Done means the device connection succeeds and JIT can be enabled without requiring both devices to restart.