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Hey guys I'm curious to know how can I write a bootloader for my MCU in Keil? My MCU is STM32F103RET6 and I want to write an USB bootloader for it.
Pretty much the same way you'd do it in any other IDE, or platform.
Given your prior posts you'd probably want start with some simpler stuff and work you're way up. http://www.keil.com/forum/58111/
ST has a built in System Loader that supports a USB based upgrade mechanism called DfuSe, there are examples around than, and a USB firmware library. There are also a number of IAP (In App Programming) examples that might also be instructive.