@Pablo_Eleven_Pablo11 Hmm… when I first put the watch in the dock the watch shows “Connected” (and my computer beeps) but there’s nothing on the “Notification” screen… 
I know this may sound a bit crazy but - would you re-flash with SP tools the firmware from the No1 website and see if you are in the same boat? I know you cannot get the watch recognised as a device but you may still have access to the boot loader to flash with the watch powered off. I mean the full firmware here https://drive.google.com/file/d/0B4Ay_s354RncWDYxTlFsNFdMSmM/view
Or even an earlier firmware that worked ok. Just don’t flash the pre-loader. Out of interest - did you flash the pre-loader when you recently flashed the watch?
What is a pre-loader?.. I stumbled my way through the flashing process…
At the moment I’m using ShareIt (Wi-Fi)…
Thank you for this… I’ll research it further 
… before I stumble into it again…
When you use SP Tools you load the scatter file which selects the partitions for you to flash. The very first partition is the pre-loader (boot loader) . It’s best practice not to flash this as it can prevent you going backwards in FW to older versions…
oh dear. well it might be able to flash again…
@Pablo_Eleven_Pablo11 A big thank you for your help on this… I’ll read your comments and consider what I need to try next
I thought that as I would be attempting to Flash (using what you sent) I would first try the OTA update on my D5… OTA went okay but I’ve ended up with the version that has “The Black Faces of Death”… I tried to connect with USB but no luck… time to Flash…
Why is the flash_tool.exe missing from the most recent (above) download?
sounds like you’re having the same problem I was talking about a few weeks back. Wonder why it affected me much earlier with the X5. I have 2, I got one to work but not the other. Had to reinstall the win 10 drivers and reflash, and I also bought a new battery cradle.
Can’t Flash because my PC doesn’t recognise my watch…
https://drive.google.com/file/d/0B9c-vl8oxm2EOWNyWTl4Q0pqSUU/view?usp=sharing
check your pins on your watch cradle, maybe one or two of them dropped down/shorter or try downloading airdroid to transfer the flash zip or sideload
@Splen_Dence Interesting… a sideload was going to be my next line of enquiry… can it be done?
I’ve downloaded the most recent No1 D5 update onto my PC - but can’t Flash as watch not recognised… the unpacked download is in three folders - drive, SP_Flash_Tool and w812a_kk… do I sideload the zipped package or some/all of the unzipped folders… and where would I put them on the watch?
If watch does not connect to pc you can’t sideload…
@Pablo_Eleven_Pablo11 I tried Shareit and downloaded a few watchfaces - so that works… can I use Shareit to put the latest firmware on the watch?
No - sorry - needs a cable to access the bootloader