New firmware:
http://www.sounddevices.com/support/downloads/mixpres-firmware
From the download page:
Last update May 24, 2018
Changes introduced in 2.20 include:
New
For all models:
Output gain range increased by 20dB.
Added Output Mute option.
Added Output Mute * shortcut option.
For MixPre-10M
Import of WAV audio files (native and non-native) when creating a Music Project.
For MixPre-10T
Displays a timecode reset notification in Free Run and Time of Day modes when timecode is reset after the timecode hold time of 4 hrs is exceeded.
For MixPre-3 and MixPre-6 only
Jump to cue marks by holding Play and rotating the headphone encoder.
For MixPre-3, -6, and -10T only
Plugin support: A new System > Plugins submenu for installing future licensed plugins.
New Record > Record Bells menu option to disable record bell notifications.
Added Inputs MS Decode submenu to select MS decoding to both ISOs and Mix or Mix Only.
Recordings that are split across multiple files now playback seamlessly.
Playback of non-native WAV files in Audio Projects.
Changed
For MixPre-3, -6, and -10T only
In Remix mode, re-recorded files are now placed in the same project folder as the source file.
A file's 'Name' has been increased to a maximum of 20 characters.
For all models:
Channel Screen meter remains visible and active when adjusting channel gain.
Headphone Clip Indicator is now displayed in power/battery level indicator in the top right of the screen.
Post fade channel clipping is now indicated by a channel's ring LED illuminating red.
Projects are now sorted by creation date/time in the Project > Open menu.
Menu screens now allow the user to switch from one parameter to another with a single touch.
Fixed
For MixPre-10T only:
USB Thumbdrive was prematurely shown as full.
Time of Day timecode was incorrect after power cycling within the timecode hold time (4 hours).
For MixPre-10M only:
Mute was not muting tracks with Input source set to Click.
Metronome Volume and Click track level were inconsistent.
Rendered audio files were not automatically copied to the USB Drive.
Cue marks that fell outside of the Play In / Stop region were still embedded in the rendered wav file.
Cue marks set as Play In, Record In, Record Out, Stop were not being moved correctly.
Rendered isolated wav files would occasionally contain discontinuities at crossfades.
Phantom Power setting was not carrying over to the linked input in a linked pair.
Playback would not always work after recording the first take in a music project.
44.1kHz sample rate would not carry over to new projects.
For MixPre-6 and -10T only:
MixPre-6 channels 5 & 6 and MixPre-10T channels 9 & 10 were displaying 6dB too high.
Solo and Mutes were not linked when Link Type was set to 'All'.
For MixPre-3, -6, and -10T only:
Audio bleed-through into the record start/stop bells.
MS balance control was occasionally resetting to center.
Cue marks were not copied from the original file to the re-recorded file.
Track Arm indicators would flash after playing back.
Phantom Power setting could be displayed incorrectly in the Channel screen after playback.
Re-recording was only possible when the source file contained three or more tracks.
Headphone monitoring source would change after playback.
Previous project was not loading when reinserting the SD card.
Recording would stop when recording automatic file splits to daily folders over midnight.
For all models:
Jumping between cue marks has been improved.
Media I/O Error message was incorrectly displayed for a full SD card.
In some DAWs, MixPre audio file signal clipping was occurring at -0.1dBFS.
Zero byte split files were created on some SD cards.
Pop-up dialog windows could appear one on top of the other.
Improved handling of pop up dialog boxes.
Improved audio scrubbing.
Improved transport handling.
Improved media performance.