ESP32 Forum

I have a Lilygo T-Display S3 that worked correctly for a certain time. Now, when I connect the USB cable, it doesn't show up as a "COM PORT" but as an external drive (with drive letter). See image. What can I do to regain control over the unit ?

Thnx !
Roland

If you have another cable then try with that. It may happen due to a bad cable. You can follow all the suggestions given here too:

https://community.platformio.org/t/unab ... ed/30577/6

Strange things are going on here !
1- tried other cable -> same result
2-changed from desktop(win10) to laptop(win11) same cable -> appeared at COM5
3-back to desktop -> no COM
4-back to laptop -> COM5
5-tried to upload some code -> as soon as the connection tries to start, the COM5 disappears (looking with "USBDView")

ERROR message :

Sketch uses 236613 bytes (18%) of program storage space. Maximum is 1310720 bytes.
Global variables use 18704 bytes (5%) of dynamic memory, leaving 308976 bytes for local variables. Maximum is 327680 bytes.
esptool.py v4.2.1
Serial port COM5
Connecting...Traceback (most recent call last):
File "esptool.py", line 34, in <module>
File "esptool\__init__.py", line 1004, in _main
File "esptool\__init__.py", line 646, in main
File "esptool\__init__.py", line 895, in get_default_connected_device
File "esptool\loader.py", line 631, in connect
File "esptool\loader.py", line 572, in _connect_attempt
File "esptool\loader.py", line 435, in sync
File "esptool\loader.py", line 351, in command
File "serial\serialutil.py", line 372, in timeout
File "serial\serialwin32.py", line 222, in _reconfigure_port
serial.serialutil.SerialException: Cannot configure port, something went wrong. Original message: OSError(22, 'A device which does not exist was specified.', None, 433)
[13064] Failed to execute script 'esptool' due to unhandled exception!
Failed uploading: uploading error: exit status 1

After disconnecting the ESP32-S3 and reconnection it reappears on COM5 ...

I'm loosing my mind ... help !
Roland

Can you try forcing the chip into download mode? You do that by connecting GPIO0 to ground (or pressing the appropriate button if the board has one) and resetting or powering on the chip.

Strange !
I tried several times to put it in boot mode without success and suddenly it worked again ! !
I don't understand what happened ...
It is still not showing as COMx (now labeled as "USB JTAG/serial debug unit") but it works
Thank all for your support !
Roland

It all depends what application you flash on S3.

In this case you got flashed MSC example, so you have to use IO0 and EN to enter bootloader mode:

Rolembeek wrote: I have a Lilygo T-Display S3 that worked correctly for a certain time. Now, when I connect the USB cable, it doesn't show up as a "COM PORT" but as an external drive (with drive letter). See image. What can I do to regain control over the unit ?

Thnx !
Roland

Then you probbaly flashed some other application, with no USB support. The same situation with IO0 and EN.

My solution,

Put down boot butom, always put down and put on reboot butom. I'm in boot mod and I can retrive my COM port and I send a new firmware and is ok.

Thank's for your answers !!!!

Max

Thanks All again !
I have had no more issues ...

Roland