Support for Meawow MHO-C402 (frozen display)

[Gucioo]

Hi,

I bought Meawow MHO-C402. With stock firmware it was not possible to connect with BT.
After checking PCB I found out electrical connections seems to be the same as MHO-C401.
Only 3 vias on the PCB were routed a bit different, moved 1-2 mm.

You did great work on the firmware and using your instructions I was able to download modified firmware:
MHO_C401_v48.bin to Meawow MHO-C402 using USBCOMFlashTx connecting Vcc, Gnd, Tx, Rst.

Now it is possible to connect with BT, but the display is frozen. Do you have any idea, what could be wrong or which firmware could work with it? How to enable eink display?

From nRF connect:
LCD I2C addr 3C
SHTxxx I2C addr E0 (SHT3V?)

[pvvx]

The display controller and the display itself can be different. This is the main difference between different models.

For example, MHO-C401 and MHO-C401N have different controllers and displays.

#276 (comment)

We don't have MHO-C402 for sale. I couldn't find it.

[Gucioo]

It is like MHO-C401. After going thru the topic I downloaded few other firmware's and it started to work again on Original_OTA_Xiaomi_MHO_C401_v1.0.0_0016.bin.
Tried re flashing custom again, but display was still frozen on MHO_C401_v48.
It doesn't blink after custom download. After original is downloaded screen blinks and displays temp.

If I will find time I may get flash / display mapping as you mentioned in the other topic.