Even if the T2C does not have a SIM card, the firmware upgrade can be done using a mobile phone (internet connection required).
Method 1: Mobile phone connects to T2C WiFi
1. Power up the T2C
2. Wait for 40 seconds, the device will turn on the WIFI network（AutoKit_xxxx)
3. Mobile phone connects device WIFI (AutoKit_xxx) Default Password (88888888)
The mobile phone accesses the Internet, the mobile phone pops up a reminder, choose to "use the cellular network"
4. Open the mobile browser and visit 192.168.3.1
5. Scroll down to the footer, if there is an update, it will appear here, and chick "Update
Method 2: Mobile phone connects to T2C Bluetooth
1. Power up the T2C
2. Turn on the Bluetooth of the mobile phone to search and pair “AutoKit_xxxx”
3. After waiting for 40 seconds, the phone will pop up a reminder, select Use CarPlay
4. Open the mobile browser and visit 192.168.3.1
5. Scroll down to the footer, if there is an update, it will appear here, and chick "Update"
*When upgrading, the red LED blinks alternately
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