Hi, please find the APM32F103 product page, including all resources involved, here: https://global.geehy.com/product/fifth/APM32F103
The SDK from this site is a Standard Peripheral Library for APM32F103 Medium Density or High Density products, for APM32F103CB, this MCU is Medium Density(MD), you might need to choose the correct Flash Programming Algorithm in your IDE or Programming Tools.
For example:



You can find the Keil Flash Programming Algorithm from the root address of Keil once you have the Device Package Family installed from “Package” folder of the SDK.
