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Upgrading USBCNC_CPU5A3 to USBCNC_CPU5A4
If you have bought a CPU5A3 and want to use the 4th axis, it is possible to upgrade. Via the 2nd setup page in
the USBCNC software, see explanation below:
CPUOPT:
This is special for CPU5A.
This button allows to add the 4th axis function on a CPU5A3. So it upgrades
from 5A3 to 5A4.
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