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Latest information
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The most recent versions of the firmware for this unit are as follows.


Main firmware : MCU V1.61 (Previously V1.54. Updated at this time)

Sub firmware  : SUB V0.40 (Not Updated at this time)

REC firmware  : REC V0.17 (Not Updated at this time)

Always use the most recent firmware version for this unit.
For information about the latest firmware, check the TASCAM Web Site.
< https://tascam.jp/int/product/cd-400u/support >


[ Precautions for updating ]
 - Main/sub firmware (MCU/SUB) and REC firmware (REC) have different update methods.
   Check the update manual of the unit and update the respective firmware to the latest version.
 - Be careful not to let the power be interrupted during the update.
 - Do not load or remove media during the update.
 - If the power is interrupted or media is loaded or removed during the update, the unit might become unstartable.

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Main firmware: MCU V1.61 (December, 24 2024）
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< Maintenance items >
 - The reading performance of CDs and CD-Rs has been improved.

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Main firmware: MCU V1.54 / Sub firmware: SUB V0.40 / REC firmware: REC V0.17 (May, 15 2024）
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[ Precautions for updating ]
Main/sub firmware (MCU/SUB) and REC firmware (REC) have different update methods.
Check the update manual of the unit and update the respective firmware to the latest version.

< Maintenance items >
 - When single playback was performed with only one audio file on the media, repeat playback would occur in rare cases.
   This has been fixed.

 - When a CD was left paused for a while, "No Music File" would appear on the screen in rare cases and the CD would stop playing.
   This has been fixed.

 - When dubbing FM/AM for a long time until the file size exceeded 20 GB, an incorrect recording file would be created.
   This has been fixed.

 - Operation stability has been improved in other ways.

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Main firmware: MCU V1.42  (October, 27 2022)
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< Maintenance items >
 - When play/pause operations were conducted, a clicking noise could be heard on rare occasions.
　 This has been fixed.

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Main firmware: MCU V1.27  (June, 8 2022)
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< New functions >
 - New external control commands via RS-232C and Ethernet (Telnet) have been added. 
   It is now possible to recall tuner presets and get status information. 
   Please use the IF-E100 Ethernet control card (sold separately) for external control via Ethernet (Telnet).

< Maintenance items >
 - If USB・SD was selected as the media and only one song was stored in the playback subject (entire media or folder), 
   repeated playback would occur regardless of the playback mode setting.
   This has been fixed.

 - In rare cases, the tuner frequency band would change when the unit’s settings were initialized.
   This has been fixed.

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Main firmware: MCU V1.23
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< Maintenance items >
 - When playing back files in single playback mode while using an SD card, the unit would sometimes continue
   playing the next file instead of stopping after playback of the selected file ended.
   This has been fixed.

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Main firmware: MCU V1.18
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< New functions >
 - Support was added for SEARCH, CLEAR, ENTER and BACK using RS-232C/TELNET.
   See the RS-232C/TELNET protocol Ver1.10 specifications for details.

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Sub firmware: SUB V0.38
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< Maintenance items >
 - When using RS-232C/TELNET, it would sometimes stop responding. This has been fixed.

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Main firmware: MCU V1.11
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< Maintenance items >
 - When skipping from an extremely short song (one second or less) to an MP3 file during playback, 
   the track elapsed time would freeze at 00:00 and skipping from that track to another track would not function
   until playback of that track completed.
   This has been fixed.

 - When a CD was not loaded, Power On Play with USB or SD media would not function.
   This has been fixed.

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Main firmware: MCU V1.10
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< New functions >
 - TASCAM IF-E100 is now supported.

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