Using the Arduino IDE to flash an ESP32-S3 with a CP2102 serial adapter after you did not do any of that in a LONG time

PS C:\Users\user\Downloads> C:\Users\user\AppData\Local\Arduino15\packages\esp32\tools\esptool_py\4.9.dev3\esptool.exe --port COM6 erase_flash
esptool.py v4.8.1
Serial port COM6
Connecting...
Detecting chip type... ESP32-S3
Chip is ESP32-S3 (QFN56) (revision v0.2)
Features: WiFi, BLE, Embedded PSRAM 8MB (AP_3v3)
Crystal is 40MHz
MAC: cc:ba:97:14:07:44
Uploading stub...
Running stub...
Stub running...
Erasing flash (this may take a while)...
Chip erase completed successfully in 8.0 seconds.
Hard resetting via RTS pin...

 

If you order everything from the cheapest vendor and your CP2102 has the weirdest cables, you may want to stick with 115200 baud instead of  921600 baud.

PS C:\Users\user\Downloads> C:\Users\user\AppData\Local\Arduino15\packages\esp32\tools\esptool_py\4.9.dev3\esptool.exe --baud 115200 --port COM4 --chip esp32s3 --before default_reset --after hard_reset write_flash --flash_mode dout --flash_freq 40m --flash_size detect 0x0 opendtu-onbattery-generic_esp32s3.factory.bin
esptool.py v4.8.1
Serial port COM4
Connecting....
Chip is ESP32-S3 (QFN56) (revision v0.2)
Features: WiFi, BLE, Embedded PSRAM 8MB (AP_3v3)
Crystal is 40MHz
MAC: cc:ba:97:14:07:44
Uploading stub...
Running stub...
Stub running...
Configuring flash size...
Auto-detected Flash size: 16MB
Flash will be erased from 0x00000000 to 0x00242fff...
Flash params set to 0x0340
SHA digest in image updated
Compressed 2371296 bytes to 1444488...
Wrote 2371296 bytes (1444488 compressed) at 0x00000000 in 130.1 seconds (effective 145.8 kbit/s)...
Hash of data verified.

Leaving...
Hard resetting via RTS pin...
PS C:\Users\user\Downloads>