Alright,
Folks updating and possessing HF coils refer to the last page at bottom of this link.
http://www.xpmetaldetectors.com/telechargement/Instruction%20manual/SUMMARY_MANUAL_DEUS_V4_V4.1_UK.pdf
To answer some questions here.
If you possess multiple coils and headphone modules.
You can update all at one final swoop.
How to do.
Load all your coils into one remote.
After downloading update.
Follow instructions.
Make sure all your head phone modules are turned off when starting.
Then follow instructions, Your different coils need to be in same area as your remote and computer are.
You will be able to monitor each coil (light) as each one is sensed and updates, your computer screen will show each coil,veing updated as well.
After coils get update, update then transitions to headphone updating.
Here is where you can make a vial mistake.
Follow the instructions to a tee.
You should only have one headset module turned on at any one time (per instructions).
For owners of multiple headphone modules, you will be asked during update process if you have additional headset mode. Just a wer accordingly and follow instructions. The instructions are very clear now.
After you are done you'll have everything updated this needs to be but whichever remotes you haven't updated.
So then hook up your remote(s) that still need to be updated.
Now when updating these remotes, any coils they have listed the update will try and update.
I recommend deleting all your coils except for one, then hook up remote and update.
Seems dialing all zeros in for coil ID and confirming will get rid of a coil in your remote.
You can add them back later, no problem.
HF coils need no update with 4.1 and will not be picked up when you are hooked to to a remote with an HF coil listed by serial number.
I have successfully updated all 3 of my units and 4 LF coils.