CarlinKit Tbox Ambient/LED Firmware Upgrade Tutorial Using Micro TF Card

Step 1: Download the firmware from the official website
https://www.carlinkit.com/download.html

Step 2: Copy the firmware to a micro SD card.
Step 3: Use the local update in the FOTA app.

It is recommended to use online upgrade, micro SD card upgrade is usually used to test the firmware version, or rollback the firmware.