• Computer OS version: Ubuntu 24.04.3 LTS
• iOS version: 9.2.1
• iOS device: 6S
• Using a USB-A lightning cable

Bug explanation:
_ After flashing to 9.2.1 and the iPhone booted, the terminal stuck at "Waiting for iPhone to boot...". I tried to re-plug and trust the computer, but the terminal is still stuck at this point.
_ I tried to re-run activator again from another terminal tab, and it pointed out that the plist at /var/lib/lockdown/ doesn't exist. I checked the folder at the same time, the plist file was created and deleted continuously extremely fast at this moment.
_ 3utool reports that the iPhone is not activated yet
_ The cellular signal is up, but I couldn't make a data connection or phone calls