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Hi All, Hope everyone is well :-) Just a quick check in to see if anyone has experienced this on your Sound Devices units, whether MixPre series or other. I recently updated my MixPre 10T's firmware to the current 2.21 version. I used the standard method of downloading the firmware update file to my MixPre SD card, using a card reader. I then inserted the SD card back into the MixPre and ran the firmware update - it completed and machine booted up in new 2.21 firmware. I then reformatted the SD card and backup USB card in the MixPre in order to erase/remove the firmware update file and generally reset and refresh the card. So far, so good. Soon thereafter, every time I would boot up the 10T, usually after a time of being powered down for a few hours or overnight, I would get the immediate pre-boot-up message "new firmware detected - updating now". The machine would then run through a "false" firmware update routine and after supposed completion would reboot itself and start up normally, though with the more frequent additional "timecode was reset" message. Thinking that this is weird because there was no firmware update file present on either of the MixPre's media cards - I had just erased and reformatted them. Next, I removed both media cards from the MixPre (main SD card and secondary USB backup card). After a period of time, (hours or even overnight) the unit sat in powered off mode with one or both hirose wall power adapter or charged L-mount battery in sled present. Upon booting the machine for the first time of the day, I still was receiving the message "new firmware detected - updating now" message. Once again, it would run the un-instigated update routine, reboot, briefly display the "timecode was reset" message and then appear to be back to normal. I wonder why the unit is thinking it detects new firmware when there is no firmware file available to it without any cards being present. Yesterday, I removed the L-mount battery/sled and connected only hirose wall power but this time left it connected (but powered off) much longer, overnight. Upon booting today from the same wall power connection, I haven't yet received the false firmware update message. I have turned the machine off and on quite a few times today at random intervals and have not seen the message reappear, which I believe is good news so far. I must also mention that early in this testing, I executed a factory "reset" of the unit, as suggested by Sound Devices - no luck - issue persisted. Tomorrow, I plan on disconnecting hirose wall power and mounting L-mount battery sled with a single freshly charged battery. I will then power on and off at random intervals to see if the anomaly reappears and if there is a pattern of behavior. I am wondering if there is an internal software glitch in the machine's built-in hardware memory, current firmweare file or an internal system battery issue that may be brought on by not having hirose power applied at regular intervals? I believe that this was a known concern with the timecode selection being grayed out and unavailable. The underlying thing is, that in addition to a concern of general operating instability, the delay in being quickly "record ready", due to the extended Firmware update - boot-up routine" is worrisome. Sound Devices has offered to examine the machine, which is great. After fiddling with my own different tests, I'll probably send it in. I welcome hearing if anyone has any thoughts or has experienced anything similar. Thanks kindly everyone - keep well:-) Cheers, Dave