Go Supreme dead - can't reset.

Purchased in 2018 it was working fine until recently now it won't boot normally - a screen appears with a monitor and GPS device showing with a red cross.
I have attempted to reset using instructions on the site but when I am at the diagnostic info page and press power button 3 times (1,2,3 quickly) it just reboots and does not go into recovery procedure.
Any suggestions as to how to reset the device would be welcome. I have e-mailed TomTom support but their advice does not work and they have given up.
Thanks

Answers
Superusers
If you have inserted a Memory card then take it out.
What happend when you connect the device to your PC on which MyDrive Connect is running and then start the device?
Ps: the three presses schould be within 1 second.
Superusers
@BillNB
Welcome to the site....
It looks like Recovery Mode has already initialized on your device....
When the device is in Recovery Mode... The device MUST be connected to your PC using the supplied USB Cable with MyDrive Connect running in the background for the Recovery process to complete....
MyDrive Connect >> MUST << be running on your PC, and be capable of displaying as >> CONNECTED << on MyDrive Connect...
Installing MyDrive Connect....
Here... https://help.tomtom.com/hc/en-gb/articles/360013959499-Installing-MyDrive-Connect
See Tomtom FAQ... Navigation device not starting or displaying a cross....
I think the device is somewhere between bullet-point (7) & (8)
See... https://help.tomtom.com/hc/en-gb/articles/360013959579-Navigation-device-not-starting-or-displaying-a-cross
Once Recovery Mode is initiated, and if a connection to MyDrive Connect has NOT established....
Recovery Mode will continue to attempt to connect to MDC until the Server eventually times-out
Any attempts at a Restart... The device, will continue to display a Splash screen with image of a PC and a Red Cross or a Screen displaying a spinning disc, until Recovery mode can establish a connection to MyDrive Connect or the Server eventually times-out....
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Superuser
I was able to get it to initiate recovery (showing Recovering device in MyConnect) but after a couple of minutes the device goes into a cycle of restarting, loading partially, restarting, about 5 times and then the red cross error re-appears.
Now I can't initiate recovery. After pressing power button 3 times quickly, it will not go into recovery just the device error (USB not connected at this point). Will try it again later when I have time.