Support

Register your product here in order to activate your Grace Design Limited Warranty. To learn more about our warranty, click here.

Firmware Updates

m908

m908 system firmware version 1.0.9

m908 firmware release notes

m108

m108 System Firmware v1.08  (07/10/2019) Supports m108 DigiLink Option Module

Windows DFU application for m108 and m905

m905

m905 system firmware version 1.18

m905 firmware release notes 

Windows DFU application for m108 and m905

m900 / m9XX

m900 / m9XX firmware v 2.4 (5/11/2018)

m9XX firmware v 2.01

m900 and m9XX firmware Instructions and Release Notes

m920

m920 system firmware version 1.5 (09/06/2017)

m920 system firmware version 1.4 (09/02/2016)

m920 system firmware version 1.3 (12/28/2014)
m920 firmware v 1.3 disables decoding and playback of DSD over PCM ‘DoP’ received via the m920 AES3 and S/PDIF. For ‘DoP’ operation, instal firmware version 1.2

m920 system firmware version 1.2 (9/29/2104)

m920 firmware release notes

m904

m904 firmware update (main unit v1.04 / remote unit v1.05)

m906

m906 firmware update (main unit v1.08 / remote unit v1.07)

m802

m802 system Firmware (m802 preamp v5.1 / RCU v6.0)

released 8/22/2016. zip file contains the firmware, the firmware upgrader programs and all the necessary documentation to properly ugrade the firmware in your m802 unit.m802 system firmware update (preamp v2.2 / remote unit v2.0)

zip file contains the firmware, the firmware upgrader programs and all the necessary documentation to properly ugrade the firmware in your m802 unit.

MAC OS X DFU appnot currently available
Discontinued Products

m904 / m904b

Owners Manual Rev H

m903

Owners Manual Rev A

m903 quick setup guide

m920

Owners Manual Rev B

m920 quick setup guide

m902

Owners Manual Rev G

m9xx

Owners Manual Rev E

model 101

Owner’s manual Rev C

model 201

Owners manual Rev C

model 901

Owner’s Manual Rev A

model 801 (1995 – 2006)

Owner’s manual Rev C

m801 (2007 – 2018)

Owner’s manual Rev B

Lunatec V3

Owner’s manual Rev E

Digital output polarity issue information (unit serial# V3001-V3496)

Voltage calibration procedure

DC input pin adjustment proceedure

Lunatec V3 firmware update form

Lunatec V2

Owner’s manual 172k

Voltage calibration procedure

Voltage calibration procedure html

AC adaptor operation issues

model 801R

Owner’s manual Rev A(For Software version 1.3)

Owner’s manual Rev B (For software version 1.4)

Software upgrade instructions

Software upgrade instructions

RCU serial cable diagram
These dowloads are .zip files which contain the firmware, the firmware upgrader programs and all the necessary documentation to properly ugrade the firmware in your unit. Both the m904 and m906 require two seperate firmware upgrades: one for the control firmware (RCU or m904 frontpanel controls) and onefor the mainframe processor firmware. The m905 has 3 firmware upgrades – the RCU, ACU and the XMOS processor

Note: please contact your local dealer or us directly (1-303-443-7454) to request the necessary WA059 PC interface upgrade cable. There is no charge to for this item, but you must have it to upgrade your m904 or m906. The m905 has USB upgrader ports on both the main chassis (ACU) and the remote control (RCU).

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