Teardown Analysis of Belon BL2028N (CB2S) SmartSwitch from AliExpress 3-for-2 Promotion

Another cheap switch from AliExpress.

It looks like this is a duplicate of this post: https://www.elektroda.com/rtvforum/topic3930515.html#20581634
but I cannot find the template in the database

Purchased under the "buy 3 for $ 2" promotion.

Aliexpress link for this switch, But the product was bought three times cheaper for the 3x promotion



The quality of plastic, assembly, and soldering is good.



The CB2S module with Belon BL2028N (==BK7231N) is installed inside.



The RX connector of the CB2S module is already in use and soldered to the main board. To flash it, you need to cut it.
It is enough to remove the tin with a braid and carefully solder the wire to the tip of the pin.



Without closing the CEN contact to the ground, the firmware update does not start.

DON'T FORGET TO SOLDER BACK RX of CB2S to MAINBOARD

The device information pulled from tuya config works fine:


JSON for the database and for configuration


Backup TUYA image readResult...-53-11.zip Download (989.34 kB)

Thanks, device is now submitted to the list as 86-TDQ INNOV2, you should be able to find it here:
https://openbekeniot.github.io/webapp/devicesList.html