Installing OpenBeken on LVWIT 5W 350Lm RGB Bulbs with BK7231T and SM2135Eh Controller

I have 6 LVWIT 5W 350Lm RGB Bulbs in my bathroom and before I swap out for Zigbee I thought I would have a play with getting OpenBeken installed on them.

WBLC9 module (BK7231T) and the SM2135Eh constant current LED controller.






Using Tuya Cloud Cutter on an old Beelink GT1 Ultimate TV box running Armbian I was able to successfully flash OpenBK7231T_UG_1.15.125.bin on one of my bulbs.

I initially looked at the blakadder template for these bulbs which showed driver as MY92x1 which prompted me to open a spare and check - confirmed as SM2135.

Now to my issue... I am totally new to this so might be an easy fix but I set the PIN configuration the same as the tear down for WOJ14415:

P24: SM2135 DAT
P26: SM2135 CLK

The chip has labels for P9 P7 P26 P24 P16 and P8 (see image)

So far all tests unsuccessful - light is default off and trying all toggles (on/off) brightness, temperature, colour results in no changes.

Is there a testing method to try and find the magic P numbers?

Added after 3 [hours] 45 [minutes]:

Managed to get the power board out and some photos of it:


Post seems to be in temp section for now... hopefully it gets moved to the correct forum location

Hello @s1dave , have you checked if the P26 and P24 connects to SM2135 with a multimeter?

EDIT: do you know that you should restart device after changing pins of SM2135 to apply the change?

Success with multimeter (thank you)

P7 - SM2135CLK
P9 - SM2135DAT

Now to use cloud cutter on my remaining 5 bulbs!

Thank you p.kaczmarek2 and OpenBeken team.

I'm happy it worked out. I will submit this topic to our online devices database along with the configuration you mentioned.

If you have any other IoT devices, please submit teardowns/information/photos from inside as well. We really want to make a good documentation for our further users.