A micro-soldering iron with an ultra-fine tip (0.1mm or smaller).

Because soldering these points requires precision on very small components, it is recommended to use high-resolution diagrams:

The ISP interface on the STK-L21 board is a 6-pin header that allows users to connect a programming cable or a programmer to the board. The ISP pinout is a standard pinout used on many Atmel and Microchip development boards.

UFI Box , EasyJtag Plus, Medusa Pro II, or MIPI Tester. Soldering Wire: Enameled copper wire ( thickness).

You cannot flash it via USB if the CPU isn't communicating. So, what is the solution?

stk-l21 isp pinout

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