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OPENMV4固件版本4.0.2就没办法用letnet数字识别了吗？文档里只有说3.6.5固件版本之前的，和openmv4 plus
因为cmsis-nn被删掉了。
被删除了是什么意思，难道是openmv以后都不支持Letnet了吗？