ESP32-C3 bare die development board - minor modifications - verification version

Using a spare ESP32-C3FH4 die, and referencing the open-source version at https://oshwhub.com/ivanli/esp32-c3-chip-mini-board, an onboard antenna was added. Because it's for testing and frequent plugging and unplugging is inevitable, the surface-mount Type-C connector was replaced with a through-hole Type-C connector, presumably for better stability. The schematic remains largely unchanged, so only the modified PCB layout is provided for those who need it. Please refer to the original BOM for the BOM as well. Only basic functions were tested after board fabrication. Feedback and corrections are welcome; thank you in advance!
 
1. The added onboard antenna is achieved by adding a 0-ohm resistor to the right side of C14; if you need to use the onboard antenna, simply solder an R10 0-ohm resistor.
2. To reduce signal interference, the onboard antenna is placed on the back. To ensure good signal performance, a board thickness of 1.6mm is recommended.
The measured wireless signal is within an acceptable range. However, due to not having a CrossAir CA-C03 surface-mount wireless connector on hand, I was unable to conduct actual testing and comparison. Please provide feedback and supplementary information if you have the necessary equipment.
3. The verified version does not have C14, C20, and L2 inductors (0402 5.6pF).
4. The active crystal oscillator was purchased on Taobao, but customer service failed to provide valuable information (the load capacitance is estimated to be 20pF, 3.3V). The link below is for reference if you need to purchase one.
 
 
5. I only had an AMS1117-3.3 on hand, not the CJA1117B-3.3 listed in the BOM.
6. I heated the soldering iron plate and then did some minor manual adjustments.
 
 
Additional notes:
a) When debugging the software and flashing firmware using a USB-to-serial adapter, please ensure you are in download mode first:
(https://docs.espressif.com/projects/esp-techpedia/zh_CN/latest/esp-friends/get-started/try-firmware/try-firmware-hardware/esp32c3.html)
That is, set GPIO8 to high level and GPIO9 to low level.
 
b) To test the CH340X functionality, you can use the official Qinheng testing tool (RX and TX need to be shorted during testing).
Download links for the testing tool:
Windows version serial port debugging software: https://www.wch.cn/downloads/COMTransmit_ZIP.html
Mac version: Search for "wchserialport" directly in the App Store.
 
c) For those interested in Tasmota, you can install it via the web:
https://tasmota.github.io/install/
 
(Offline version is attached for reference).
Other versions can be found at the following download links:
https://ota.tasmota.com/tasmota32/release/ d) Download guide
 
for the flashing tool and AT firmware (see attachment) provided by Espressif : https://docs.espressif.com/projects/esp-at/zh_CN/latest/esp32c3/Get_Started/Downloading_guide.html AT firmware for Espressif's ESP32-C3 series modules: https://docs.espressif.com/projects/esp-at/zh_CN/latest/esp32c3/AT_Binary_Lists/esp_at_binaries.html (Official recommended version: https://dl.espressif.com/esp-at/firmwares/esp32c3/ESP32-C3-MINI-1-AT-V3.2.0.0.zip)