Mcu Upgrade Procedure - NAD C 546BEE Service Manual

MCU UPGRADE PROCEDURE - TMP86FS49(MCU)
1. Upgrade via USB interface on C546BEE unit
Upgrading via USB interface is available for units with MCU ver 0.4.4 or later version. And every unit with any version
can be upgrade via UART interface, maybe with different passwords.
Put the software file for upgrade into the root folder of a USB device and rename it as 'host.h16', and upgrade as
following procedure:
1). Power on C546BEE, Long press the panel key 'Display + << (fast backward)',not at reading or playing status is
better. The VFD will display the MCU software version such as 'MCU Ver 0.4.4'as below:
2). Press the panel 'Play' key while displaying the MCU software version, then the VFD will display 'Updt MCU SW?'.
3). Press panel 'Play' again and the VFD will display 'MCU Updating'.
MCU upgrading starts and it would last about 1 to 2 minutes. If upgrading is not successful or no file for upgrade in the
USB device, the VFD will display 'MCU Updt Fail'. The unit will enter standby status after successfully upgrading.
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