Support TCP-Based JIT Activation for iOS 18.2+ (QUIC Deprecated)

With the release of iOS 18.2, Apple has removed support for the QUIC protocol, which breaks the current JIT activation flow used by AltJIT via the start-quic-tunnel command.

I’ve been able to manually start a TCP-based tunnel using:

python3.13 -m pymobiledevice3 remote start-tunnel

This works as expected. However, AltServer still attempts to call start-quic-tunnel, which no longer exists in the latest versions of pymobiledevice3. This leads to the following error:

Error: No such command 'start-quic-tunnel'

Request:

• Please update AltServer / AltJIT to support TCP-based tunneling for JIT activation.
• Ideally, allow users to manually start the tunnel and have AltServer skip tunnel setup if one is already running.
• Alternatively, integrate TCP tunneling natively into the AltJIT process using Python 3.13+.

Environment:

• macOS with Python 3.13
• pymobiledevice3 v4.20.23
• iOS 18.2+ device
• AltServer 1.7.1

Let me know if I can help test or provide further details.

Start by locating the AltServer or AltJIT entry point that invokes start-quic-tunnel, then compare its behavior with python3.13 -m pymobiledevice3 remote start-tunnel. Define the completed behavior as successful TCP-based JIT activation on iOS 18.2+ and handling for a tunnel that was started manually.