Cannot upload to Wemos Lolin32

[spuzesp32]

I recently got a Wemos Lolin32 from here. I installed the CP210x driver for MacOS. When I connect the device to my macbook, it boots and the blue LED starts blinking. I also see the serial device /dev/cu.SLAB_USBtoUART appear. When I load up a serial monitor with baud rate 115200, I can see the device printing:

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Hello, My firstESP32 !
Jul 25 2017 17:55:07
Hello, My firstESP32 !
Jul 25 2017 17:55:07
...

This repeats once a second. However, when I try to flash the device from the Arduino IDE, it simply hangs while trying to connect:

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lobal variables use 32828 bytes (11%) of dynamic memory, leaving 262084 bytes for local variables. Maximum is 294912 bytes.
esptool.py v2.0-beta3
Connecting.....

After this, the USB/Serial driver appears to completely kill my system causing several processes to stop responding. It requires a restart before everything is back to normal.

I also have/had a Sparkfun Thing and had no problems with it which makes me think this is either a problem with the device, or the Mac serial driver (the Sparkfun uses an FTDI chip which uses a different driver). I'm pretty sure the version I bought from the above Aliexpress seller is a clone, however I'm not sure if that is the reason uploads fail, after all, someone somehow managed to flash the blink program that came with the device... Any ideas what might be wrong?

[chadparker]

I am having this exact same issue. The Wemos Lolin32 is my first ESP32 board. I'm hoping this is a temporary issue with the Mac CP210x drivers, as I've also ordered a Wemos D1 Pro Mini (ESP8266), which uses a CP2104. Is there a trick to getting these to work on macOS?

[jaxxon]

Same issue for me...

[jaxxon]

I just fixed my issue, seems the Silabs v5 VCP driver was the culprit. It's not on their site now so I'm assuming they pulled it. v4.11.2 works for me.

[spuzesp32]

This is definitely a problem with the serial driver. I was able to successfully communicate with the device from my Linux laptop. Thanks to jaxxon for the info about the Silabs driver, installing the v4.11.2 of the driver now works fine on my mac also.

[jaxxon]

This is definitely a problem with the serial driver. I was able to successfully communicate with the device from my Linux laptop. Thanks to jaxxon for the info about the Silabs driver, installing the v4.11.2 of the driver now works fine on my mac also.

Great to hear.