Am I doing something wrong here?
Per update thread: S2400 Firmware Updates
Uploaded Nov. 22 update to root of SD card using MSC mode. Leave MSC mode, nothing happens. Is there something I am missing?
Repro:
[I removed the video because I don’t want someone on YouTube stumbling on it and thinking something negative about the 2400. All it showed was me copying the update file to the open MSC folder, exiting MSC mode, and then nothing happening.]
By the way I was able to do a forced update successfully.
Yeah there is a release note about it.
“Fixed not recognizing an update on the SD card after exiting MSC mode
So, if you use MSC to do this update, eject and reinsert the SD card after exiting MSC mode”
I ejected and reinserted the SD card to finalize the update. Hopefully in the future it can be done like previous updates. Exit MSC mode and then automatic update 
i have only ever used MSC to do this and @kbraiden how did you do a ‘forced update’?
drag n drop is how the 2400 has always worked
it reads to me like it will need ejecting this time only - will be updating later
I didn’t put 2 and 2 together on that that release note (although now I see it is called out twice). I would recommend that if there is a release note that affects the ability to actually install the update, put it first instead of last in the list. My eyes glaze over after the first few fixes and jump down to changes and new features.
Also, I didn’t mention it (because it didn’t work) that after trying the MSC method I did turn off the machine, pull out the card, reinserted the card and turned back on the machine and like I mentioned that didn’t change anything.
It sounds like that is not quite the method to fix this? I guess I should have pulled out the card with the machine running?
Followed these instructions from the Firmware Update first posting:
Emergency / Firmware Recovery Procedure
If for any reason, due to power cut, or other failure, your machine won’t boot afterwards, remove the SD card and insert into a computer.Copy the downloaded file onto the ROOT of the SD card but this time, rename the file extension to .UPF instead of the default .UPD (This will perform a forced update on power up)
Re-insert the card into the machine with the power off, and then power on.
THE MACHINE WILL APPEAR DEAD FOR A COUPLE OF MINUTES WHILE IT PERFORMS A FORCED UPDATE
How many MINUTES ?
I think they just said minutes to cover themselves. I don’t think it took a full minute for me.
it´s more then 30 minutes for me 
I added the .UPF in the end of the file = S2400_20211122.UPF 
forced update is not working… my machine is dead now 
That is not good. I should say that I don’t work for Isla Instruments so I am not sure that is the recommended way to get around that issue. Perhaps try loading the prior FW version? Again…I do not work for Isla so you may want to contact them for an official fix.
Hi Thorhallur,
Sounds like your power cables are sat too close to your communication ribbon inside the machine.
You’ll need a T10 hex screwdriver to remove the side closest to the main encoder and then once you’ve done that, manipulate the cables so they look like they do in this post: Firmware update hangs, emergency update also hangs - #3 by otobot
Once you’ve done that, put the .upf on your SD card, insert it and power up the machine. You’ll see it boot up normally and you’ll be good to go.
FIXED
the Reboot takes about 8 minutes
Curious… will wrapping these power cables (or communication ribbon) with EMI shielding-tape improve performance and/or further mitigate any other possible issues?
yes. I wrapped these power cables together and now the machine works 100%
had the exact same issue and solution. removing and reinserting the SD card after dragging the .UPD file to the card through MSC mode finally brings you to the update firmware dialogue screen after you exit MSC mode.