Flashing without desoldering, 2nd way

[emmrichd]

Hello,

for me the flashing procedure without desoldering did not work.
However, I found a workaround:
https://familie-emmrich.de/Ketotek.jpg
I cut the RX connection on the PCB.
I also used the standard wiring, i.e. dragging GPIO0 to GND.
Don't forget to reconnect RX after flashing.
Enjoy.

[pseudex]

also had no luck without desoldering. The device didn't boot into bootmode.
After desoldigring the pcb with the esp it worked.

[seby90]

For my part, I could not flash the ESP either, but I think the main problem is to connect the GND to GPI00 (and not the 3.3V as the photos indicate!!)

[DrHouseIT]

@emmrichd I tested your variant and disconnected the Rxd connection on the board.
Unfortunately, no connection can be established. Do you have a tip what it could be?

[seby90]

100% success for me and I have to disconnect the RX pin and I have to connect the GPIO0 port to 0V

[DrHouseIT]

100% success for me and I have to disconnect the RX pin and I have to connect the GPIO0 port to 0V

No it works also at me. Tx/Rx was swapped 😀

[Gaudi111]

I can confirm that neither connecting GPIO0 to GND nor 3.3V allowed me to program the board without soldering.
I have tested connecting Tx/Rx the two ways.
Will test later and confirm if it works desoldering the module.

[Gaudi111]

I had to remove the board to backup and flash.
I was a little bit finicky to get the connection right. I backed up twice the original contents and checked checksum to ensure the original firmware is preserved before playing with ESPHome.

[gordio]

1. GPIO0 must be connectd to GND before providing VIN, so chip can boot to flash mode.
2. (in my case) w/ full PCB voltage drops to 2.7v, so I quickly provide 5v (potentially danger) for flash simple fw, and after able to flash specified version by wifi;

[andySFRD]

Please see the updated documentation for the KETOTEK KTEM06 https://tasmota.github.io/docs/TuyaMCU-Devices/#ketotek-ktem06.
Can you confirm that the DDS238 is identical in construction? (at least for the version of DDS238 that is based on TYWE3S)

[gordio]

Please see the updated documentation for the KETOTEK KTEM06 https://tasmota.github.io/docs/TuyaMCU-Devices/#ketotek-ktem06. Can you confirm that the DDS238 is identical in construction? (at least for the version of DDS238 that is based on TYWE3S)

Looks identical It's HIKING [TOMZN] DDS238-2 WIFI Assembled in 2023-04-11: