Further to my post of Thursday, 10 OCT - Reporting progress.
Although the clue to my problem was in one of the older posts in this thread, I missed it.
When the Line6 Techie was giving his advice about updating the driver I misunderstood (or he wasn't really clear) and thought he was referring to onboard drivers.
What I didn't realise was that he was referring the drivers on my PC.
I went back through the posts and found what I needed.
Here it is. But what it doesn't say is BE PATIENT. During the driver update, do NOT have the Amp on or connected in any way to your PC.
AFTER the driver has updated THEN follow the procedure for updating the firmware. I very carefully followed the instructions and VOILA, my AmpliFi is back to its best.
Don't panic when all the LEDs turn off this is just the updater doing its thing and it takes a minute or two. when the update is completed flashing LEDs will re-appear and the Amp is ready to go again.
SOURCE: Line6Tony With many thanks.
I'll leave my original post but will edit out the legal mumbo jumbo so people can decide if my resolution fits their needs.
Here are the steps needed to update an AMPLIFi with Windows or OSX. The whole process should only take about 5 minutes. Click on each image to expand it.
Windows users: IMPORTANT First thing that needs to be done is to download the Amplifi driver from www.Line6.com/software if you haven't already. Here's the link:
Download and install Line 6 Updater from www.Line6.com/software, using the links below:
Win 7, 8, and 10
Connect the Amplifi gear to your computer with a standard USB A/USB B cable, and then run Line 6 Updater program.
With your Line 6 user name and password, log into the program.
Click on the connected Amplifi. Here, we're updating the TT.
Click on the latest version of firmware from the top of the list. You do not have to install each previous version, just the latest.
This page shows you what you'll need to do if the update fails (we'll go over this at the end in detail). In the meantime, hit Next.
Here's the program doing its thing.
Once done, power cycle the unit.
Forget or unpair the Amplifi unit from your mobile device's Bluetooth menu. Press and briefly hold the Bluetooth button on the Amplifi until it flashes quickly. On your mobile device, go to your Bluetooth settings and select the device, as it's trying to connect. Once reconnected, launch the Amplifi Remote app.
In the event that the update fails, or the gear isn't rebooting properly after the update, you'll need to enter update mode by holding down "Tone" and "Tap" while booting up. If using the FX100, hold down footswiches A and C.
Note: If an update continues to fail, please try another computer's USB ports. USB port stability can vary between computers.
NOTE TO FX100 OWNERS: After performing the steps below, you must perform a reset and a pedal calibration. Here are the instructions for that: http://line6.com/support/page/kb/_/effects-controllers/fx100/post-flash-update-instructions-for-fx100-r645