Troubleshooting WK-US2-TC Flashing OpenBeken: Firmware 1.1.17 vs. 1.1.8 Issues

Question

Ordered WK-US2-TC to flash OpenBeken based on: When trying to flash, I noticed the Cloudcutter template is based on firmware 1.1.8. However, checking my device firmware with the Smartlife app gives 1.1.17. I have tried both the provided option (1.1.8) and using By firmware version and name...

p.kaczmarek2 · Answer

Cloudcutter is not very reliable. What about flashing by soldering wires? Would that be possible for you?

123qweasd1 · Answer

It is my next option, however at first glance I guess I'll have to order the 2x104 capacitors and voltage regulator as per proposed connector (is there any flexibility on parts ratings and/or can I use the same USB to TTL Serial Adapter (CH340) as for Tasmota flashing?

Also the chip can't be extracted and contacts are not easy to reach.
But I'm willing to give it a try if chances of success are good.

Let me know what you think.

Thx

p.kaczmarek2 · Answer

Those 104 capacitors are not necessary, and if your device has LDO on the board (please provide more photos), you can just use it.

123qweasd1 · Answer

Below.

I guess the AMS1117 is the onboard LDO? Can you confirm revised connector wiring if I am to try it?
Also do you think it can be done "in-circuit" as removing the top board would be beyond my tools & efforts I am willing to deploy.

PS: pictures are from the KS-604S; I ordered both models for testing. They are very similar in design and neither can be flashed with Cloudcutter.

p.kaczmarek2 · Answer

If RX/TX is not used for anything, then you can try flashing in circuit.

Connect 5V to the input of AMS1117-3.3V (check datasheet! Triple check it!) and GND to GND, then connect RX to TX and TX to RX (as usual).

Start flashing in flasher (first read 2MB backup),, then disconnect and reconnect 5V power to do a power cycle.

It should start flashing.

123qweasd1 · Answer

Thanks for the feedback, does this look right?

Will be using BK7231GUIFlashTool, step 1 read to test, then step 2 (with power cycle once ready to write)

Let me know if this makes sense; will report back once tested.

p.kaczmarek2 · Answer

If your 5V pin on the USB to UART converter is connected directly to USB, then you don't need second USB cable.

Futhermore, don't connect 3.3V from USB to UART to anything.

You need to do:
USB TO UART GND ---> to GND
USB TO UART RX --> to TX
USB TO UART TX ----> to RX
USB TO UART 5V ---> To the input of LDO on your board (AMS1117-3.3V IN), so at the output of AMS1117-3.3 you get... 3.3V.

123qweasd1 · Answer

So like this (changing that jumper from 3.3v to 5v prior) right ?

p.kaczmarek2 · Answer

This should work, but jumper for logic levels should be in 3.3V mode. UART levels are in 3.3V. And Beken is powered by 3.3V via AMS1117-3.3. You are connecting correctly 5V to the input of AMS1117-3.3V, but still, at the output of AMS1117-3.3, you get 3.3V.

123qweasd1 · Answer

Thx. Just checked USB2UART 5v pin does provide 5v while keeping jumper on 3.3v so should be good. Will test my soldering skills and report back

Added after 4 [hours] 40 [minutes]:

Success for KS-604S ! =)

I have used ground from block J7 for easier access and a small inline switch on 5V to manage the restart required while flashing.

Device configuration, as extracted from Tuya: 
- Button (channel 1) on P11
- Relay (channel 3) on P6
- Pair/Toggle All Button on P23
- WiFi LED on P10
- Relay (channel 2) on P8
- Button (channel 2) on P24
- Relay (channel 1) on P26
Device seems to be using CB2S module, which is using BK7231N.
And the Tuya section starts, as usual, at 2023424

Log in, to see the code

What a great project. Congrats.
Let me know if you need more feedback/data on this one.
Thx

Added after 2 [hours] 24 [minutes]:

Success for WK-US2-TC ! =)

I have used ground from the CB2S board as block J7 has no ID's on this model.

Device configuration, as extracted from Tuya: 
- Button (channel 1) on P11
- Relay (channel 3) on P6
- Relay (channel 4) on P7
- WiFi LED on P10
- Relay (channel 2) on P8
- Button (channel 2) on P24
- Relay (channel 1) on P26
Device seems to be using CB2S module, which is using BK7231N.
And the Tuya section starts, as usual, at 2023424

Log in, to see the code

Original firmware backups attached as well.

Hope this helps, cheers.

123qweasd1 · Answer

Hi @p.kaczmarek2 ,The manufacturer (Moes) slightly changed the board design and I can't flash it anymore. CB2S is still there / identical.The only significant change is the AMS1117 location so I just connected 5V to the same 5V input pin on the AMS1117The device behaves as usual (lights on when connected to USB so I assume power is right) But when I try the 5V power off/on to start sync, it just never starts or fails.I've tried 2 units unsuccessfully and my soldering has been triple checked.Any clue what could be wrong or suggestions for troubleshooting? See pictures below:

123qweasd1 · Answer

>>21707320 And unfortunately the CEN pin doesn't seem to be exposed so I can't try the alternative method. Let me know what would be the best course of action or troubleshooting ideas. Thank you!

123qweasd1 · Answer

I was able to locate CEN on the CB2S board and tested the CEN to ground method, same result.

Is it possible that this new model can only be flashed off circuit? (Almost impossible, too complicated to disassemble)

Also can we use the 3.3v output from the USB-UART instead of feeding 5V to the LDO?

Troubleshooting WK-US2-TC Flashing OpenBeken: Firmware 1.1.17 vs. 1.1.8 Issues

Post #1

Post #2

Post #3

Post #4

Post #5

Post #6

Post #7

Post #8

Post #9

Post #10

Post #11

Post #12

Post #13

Post #14

Didn't find an answer? Ask Artificial Intelligence

Topic summary