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Do not use firmware from or ZB631KL —the partition tables differ.
Once you have located the , follow this exact procedure: zs620kl test point
Disclaimer: Shorting test points bypasses safety checks and voids warranties. This information is for educational purposes. Unless you are an experienced micro-soldering technician, seek professional help for a bricked ZS620KL. Do not use firmware from or ZB631KL —the