Request for teardown of GU5.3 RGBCW Lightbulb & Smart Wi-Fi Tower Fan

Hello. I'm not sure if this is the right place, but I own a Connect SmartHome 5W GU5.3 RGBCCT Bulb and a Goldair Electronic Tower Fan.
These are my last two Tuya devices at home that I can't flash. They were both bought this year. I made a PR for the Goldair device for Tuya Local and it works great. But I want to completely remove Tuya. It seems currently the only templates are for fan controllers, but not fans themselves.

Regarding the smart bulb, I couldn't get it flashed either. Maybe this particular build of light is yet to be teared down.
Both devices are quite cheap. I'd be keen to donate a new one or both of these devices to someone that's willing to tear it down. I myself don't want to do it as I don't have the expertise, or willpower to do so, and would rather not damage my devices. Is there a donation link somewhere that I could essentially put a bounty on for these two devices? Fortunately, there is an equivalent Zigbee version of the smart bulb, but I can't find anything close to a smart tower fan that works with Zigbee or anything other than Tuya.]Link[/url]

Hello, can you give a specific links to shops for those devices?
Also, maybe include screenshots before those links expire.
Donations go here:
https://www.paypal.com/paypalme/openshwprojects
Me or @DeDaMrAz can consider ordering those devices, depending on their prices and shipping cost to our countries (Poland or Serbia). As far as I know, currently @DeDaMrAz has some devices in queue so most likely it would be me doing the reverse-engineering.

Here's a sample device support story:
https://www.elektroda.com/rtvforum/topic3991620.html

Hi. Yes, that could make it difficult to ship to those countries, given that they're Australian products.
Here's the link to Smart Downlight.
Maybe a similar device from Aliexpress would be identical enough. Benexmart Tuya Zigbee Smart Led.

This is the link to the Goldair Fan. Perhaps if someone in Australia sees this post, then they could help. Otherwise, there might be similar ones online.

So maybe I can guide you step by step through the process? Have you tried to open that bulb to see what's inside?

Yeah, it's probably going to work out best that way. I'll see when I get time to open up the bulb. I'll probably have to buy some tools first. What are the best tools to open this sort of light?

This is the worst possible bulb type to open. Some of those bulbs have base contacts made in such a way it's hard to put them back it. I know @ferbulous was trying to convert some of those bulbs with some success, but maybe he can tell more about it. I personally don't have that kind of bulb sockets in Poland.

The first step would be to delid first the translucent cover to see the LEDs, and then try removing the board with LEDs.

Please make photos along the way, we like to document IoT devices here. This will make a good entry for our list:
https://openbekeniot.github.io/webapp/devicesList.html

If the cables inside are long enough, then you can pull the PCB from the casing. There should be no problem.
The issue is that some manufacturers just use really short cables that force you to remove the bottom pins, which might destroy the bulb case in the process, like what I did.
If you do get the short cable version, try to reach and cut the cable inside using a cutter and solder longer ones to it for reassembly.

Thanks so much to both of you for the tips and help.
I'll try to open up the bulb sometime.

Now, regarding the tower fan. Opening it up was actually very straightforward. Unfortunately, it has a WBR3 chip. I've never done any soldering in my life, so I'm gonna have to get some practice first before I think about swapping it out. However, if WBR3 gets official support in OpenBeken, that'd be awesome.
I read that getting WBR3 chips on their own is quite hard. But I've found one available for purchase on Aliexpress. https://www.aliexpress.com/item/1005003735356193.html

I understand that these are pretty rare and there are likely more urgent things to work on. But if donating a chip will help, let me know.
Thanks!

Hot air would be easier for this.
You could get a cheap hot air gun, point it to a soldering wire.
Once it starts melting, that’s when you start heating up the pins around the chip and slowly lift the chip.

Also related:

I opened up the GU 5.3 Smart bulb. It has a W800-B400 Wifi chip. I've not heard of the B400 version mentioned anywhere, only the C400.


Can this be flashed OTA? If not I'm not even sure where to plug any serial adapters in.

There is no tuya_convert currently for W800, but OpenBeken runs on both W600 and W800 and once you flash once by wires, then you can update firmware remotely.

It seems there may be UART pads on the board. Clean the board and do more detailed photo.

Where would I attach the wires on this particular board?

It seems there are pads under the glue here:

Can you remove the glue first so we can investigate?

Oh yes, you're right. There are pads there.

Can you get somewhat better quality out of it?

We need to know where do they connect, namely to which QFN pins of W800 they are connected.

It seems that... we also need to find a datasheet of W800-B400 or at least of W800-C400 .
Interestingly enough, it seems there are no mentions of W800-B400 over the web?

Yes, it seems W800-B400 is not mentioned anywhere on the internet. I guess I made a new discovery
Below is a higher-res photo of the board.

Here is the pinout:

Now you can match crystal oscillator pins:

i have started mapping the pins in paint, I've already found boot pin. Can you finalize the mapping?

@BenAndo what is the state of your W800-B400, have you managed to flash it?

@p.kaczmarek2 unfortunately no I never did get it flashed. I wish I had of given it a better go. I was ultimately trying to find a bulb that could be flashed OTA without being opened up first. Since first making this post I discovered there is a GU 5.3/MR16 bulb that can be flashed: https://github.com/tuya-cloudcutter/tuya-cloudcutter/issues/383
Philips Hue also came out with a GU 5.3 bulb.
I can't find my W800-B400 so I'm guessing I disposed of it.

Regarding the tower fan, I desoldered the WBR3 and swapped it out with an ESP12-F.