How to extract locomotion firmware of Cyberdog

1. Copy the following files to a aarch64 host (afptool aarch64 only)

   • [MR813]/usr/bin/afptool

   • [MR813]/etc/publickey.pem

   • [MR813]/etc/OTA_Key_pub.pem

   • [NX]/etc/ota_server/download/p2151_update-4.1.2_0071.img

2. cp p2151_update-4.1.2_0071.img fw.bin

3. openssl smime -decrypt -in fw.bin -binary -inform DEM -inkey publickey.pem -out fw.zip

4. unzip -P cMPXOzSlYQlJI8RkrW1ddkyw6hfRUFYPCNOtUJTAqAwYHdAphg fw.zip -d fw/

5. openssl dgst -sha256 -verify OTA_Key_pub.pem -signature fw/firmware.signature fw/update.img

6. ./afptool -unpack fw/update.img update/