● A critical error may occur if another PC or application communicates with the machine (for example, when printing is performed) while the 昀rm re is being updated. In addition, do not turn OFF the machine or disconnect the interface cable (USB or LAN cable) while the 昀rm re is being updated. If a critical error does occur (the machine is turned ON but does not start up, etc.), the machine will need to be repaired.
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