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· Confirming firmware version
8. With the confirmation of only the DSD LED flashing in red, power off the HP-A4BL by turning the [POWER]
switch / Volume knob to the left. Then, with the micro SDHC card being inserted into the HP-A4BL micro SD card
slot, power on the HP-A4BL by turning the [POWER] switch / Volume knob to the right. The HP-A4BL overwrites
the firmware version in the "HPA4BL_VER.txt" file placed in the root directory of micro SDHC card.
* CAUTION
As explained in the before mentioned procedures 1. ~ 4., the HP-A4BL creates the "HPA4BL_VER.txt" file
and writes the firmware version in it. After executing the firmware update, if the HP-A4BL power is not cy-
cled, the firmware version in the "HPA4BL_VER.txt" file will not be overwritten meaning that the previous
firmware version number still remains. After updating the firmware, make sure to cycle the power so that
the "HPA4BL_VER.txt" file is overwritten.
9. After confirming that the HP-A4BL power LED is lit in green and the Fs: 44.1kHz LED flashes in red, power off
the HP-A4BL.
10. Remove the micro SDHC card from the HP-A4BL.
After fitting it into the SD card adapter, insert it into
the Windows PC/Macintosh SD card slot. Then,
open up the "HPA4BL_VER.txt" file in the root
directory of the micro SDHC card and check if the
version number (V1.10 in the lower right example)
matches the one of the firmware update file that you
have used.
The above procedures complete the HP-A4BL firm-
ware update.
How to update the HP-A4BL firmware
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3
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