How to fix C19/C28 and Joint communication Error

xArm Wiki
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  1. If your xArm Studio and firmware verison are earlier than 1.5.0, that may caused by the software issue. Update both the xArm Firmware and the xArm Studio to the latest version(≥1.6.1) will solve the problem.
    Here is the guidance to update the xArm Firmware and the xArm Studio:
    http://help.ufactory.cc/en/articles/4080803-guide-to-update-the-xarm-studio-and-xarm-firmware

  2. If the step 1 does not work, please refer to this article and contact support@ufactory.cc

    What should I do if I have a problem with UFACTORY xArm? | UFACTORY Help Center