STC's smallest development board

Thanks to the event organized by STC and LCSC EDA, I was introduced to C51 programming. I wanted to learn both C51 and STC32. I discovered that the STC8H8K64U and STC32G12K128 are pin-compatible. To facilitate learning, I built a mini development board, bringing out all the pins. To keep it small, I didn't add many features, but I did bring out a 4-wire I2C OLED screen. It supports protocols like SSD1306. Size is not limited; I used a 0.96-inch white screen for testing. 
Because of its small size, the board doesn't have many functions, but you can connect external components using DuPont wires or female headers. It only provides one custom LED1. The download button can also be customized. 
It supports plug-and-play switching between 8-bit and 32-bit programming for both STC8H8K64U and STC32G12K128. I used STC's official example code for writing and testing. It supports flashing via USB HID and USB CDC, which is very convenient. The first time you need to press and hold the download button to power on, you can use the official tool STC-ISP to download without power! It really is uninterrupted (no exaggeration)! It also supports simulation debugging (after setting it up with STC-ISP, click Debug in Keil)!
Just after I finished making this mini development board, the latest dual-core MCU STC8051U was released, supporting free switching between 8-bit and 32-bit. Very powerful. However, note that this board does not support the STC8051U; the pins are incompatible. 
Below is a picture of the actual board. It's very simple, very small, and very easy to use. (I thought it was small enough, but actually, I saw a post from a forum expert on the STC forum that was even smaller. He placed the pin headers closer to the MCU, and the silkscreen was abbreviated or tilted because it wouldn't fit horizontally.)
The code used for learning is the official example code, which can be downloaded from the official forum, or you can also download it using the powerful and versatile tool STC-ISP (in the menu, you can download the instruction manual, code examples, Keil device packages, header files, etc.).