Online upgrade failed，how to update CT-3 with standalone firmware

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When CT-3 firmware upgrade using PC software fails.
It is possible to update using standalone firmware, please follow the steps below.

Step
0. Download and unzip the independent firmware package at the end of this page (the file name is version number, for example, 10062.zip is V1.00.62)
1. Cut off the power supply of the meter.
2. Turn the trackwheel to the left and hold.
3. Connect the meter to the computer through the connection port (micro-USB port) (at this time, the dial is still pressed to the left).
4. After almost two seconds, the header screen displays the words "Bootlodaer..." and the computer recognizes a disk.
5. You can release the button.
6. Create the "FW" directory in the newly recognized disk and copy the files you just decompressed into it. (Structure such as "u-disk:/FW/…")
7. Wait for the copy to complete.
8. On the table header, select and enter “Update From Int.Memory”.
9. Wait for the update to complete and then select "Reboot"

Firmware for CT-3
10062.zip