The AT firmware should work with all ESP32-C3 products.
Firmware link:
https://docs.espressif.com/projects/espat/en/latest/esp32c3/AT_Binary_Lists/ESP32-C3_AT_binaries.html

Upload method:https://docs.espressif.com/projects/espat/en/latest/esp32c3/Get_Started/Downloading_guide.html

USB port on the board or on your computer is broken?

If the USB port on the board is broken, you can buy an external USB to RS-232 (logic level) board and connect that to the RX & TX pins.

Note that depending on how the on-board USB port failed, the failed components may be holding the TX or RX pins in a state that prevent the external USB to RS-232 from functioning. If you are certain the on-board USB port has failed, the power line to the existing USB bridge chip should be cut or lifted.

In the end, it may be less expensive to purchase another TTGO Display-T.

@sasetcolombia You need to use unused IO pins. For example the IO2、15、18、19....... This can be seen in the schematic diagram

To achieve this function, it needs to be implemented in software to rearrange the pixel arrangement. Or you can use lvgl, for screen rotation.

Please use this app to test. https://github.com/Xinyuan-LilyGO/LilyGo-LoRa-Series/tree/master/examples/SleepTest

@jimh
Hello, pins above 34IO can only be used as input

@tcccorp 1. To set the local SMS center: AT+CSCA=""+ Press Enter, return OK. For details, consult your carrier.
2. AT+CMGF=1: Set the SMS mode to TEXT.
3.AT+CMGS="phone number"< enter >, set the receiver phone number, then return: ">",
Send desired content, such as "Send Massage Test!" You don't need a carriage return at the end,
After editing the SMS message, send the message in hexadecimal format 1A (1A is the key value of CTRL+Z, which tells the module to send the message.
You can also send 1B, that is, "ESC" to cancel the operation.) After the sending is successful, the module returns +CMGS: 15 to confirm the successful sending.

The factory firmware uses MY-TTGO-WATCH firmware, the original firmware offset touch coordinates is too large, you can refresh the firmware in TTGO_TWatch_Library , it should work fine, if you want to recompile the firmware, you can change the scaling here My-TTGO-Watch

@papbo What is your current ESP32 version? Try upgrading?

You mean put the watch on the table, touch the panel and it will move by itself?
You can try to write TouchPad Example into the watch, then put it on the desktop without touching it, and check whether the coordinates on the screen will change. If it changes by itself, please contact customer service for after-sales processing.

Is the driver for CH340 installed? Is the correct baud rate used?
Driver download link

@winfried Hi. You can use the 3.7V battery in your picture to power the T-display, note the +, — signs.

@gandalf Hi. The USB port has no detection circuit design.

@yu Hi. The test range requires one transmission and one reception to perform the range test, and care should be taken to choose an open and unobstructed place. The sender can be placed in a high place if allowed.

@jimh
5V DC and USB can be recharged

@jpvonoy
pinMode(25, OUTPUT);
digitalWrite(25, LOW);