Hi troggy, danskeman, nememo,
I have solved the problem! Based on all your feedbacks, I eventually concluded that my problem was something fundamental at the USB cabling level. Since one was not supplied with my Linx 8, I went back to my supplier (Wiziwoo) and acquired one of the OTG cables normally supplied with Linx 7 and Linx 10 systems (i.e. cable with Micro USB B connector on one end and female Standard USB connector on the other). I now find that both of the following configurations allow me to finally see a bootable Macrium Reflect Free Rescue USB flash drive:
1. MRF Rescue USB drive connected directly to female Standard USB connector of the OTG cable, and micro USB B connector connected to Linx 8. I now see a "EFI USB Device (General UDisk)" option under EFI Boot Devices in the Boot Option Menu! I can boot up Win PE and get into Macrium Reflect Free, but then cannot do anything since touch is not supported and I have no keyboard or mouse available, plus I cannot see my MRF backups on a external USB hard drive. However I can presumably use this solution for a bootable Win 8.1 USB Recovery drive (have not tried that yet).
2. Using my EasyAcc USB 3 Hub connected in "Self-powered mode" i.e. (You need to be registered to view this link, please log-in or register
a. EasyAcc Hub's supplied power cable plugged into the power IN socket, and the USB Standard A connector on the other end plugged into the 2 amp Wall plug charger that came with the Linx 8
b. Linx 8 connected to the EasyAcc USB IN socket, using both the above-mentioned Linx 8 OTG Cable and the Standard USB A to Standard USB B that came with the EasyAcc Hub!
(Previously, I was using the Micro USB B to Standard USB A cable that came with the Linx 8, which does NOT work).
c. Bootable Macrium Rescue USB flash drive connected to EasyAcc USB OUT port 1
d. USB Keyboard connected to EasyAcc USB OUT port 2
e. USB Mouse connected to EasyAcc USB OUT Port 3
f. External self-powered 2Tb Seagate USB hard drive containing my MRF backups connected to EasyAcc USB OUT Port 4
Using approach #2, I also now see a "EFI USB Device (General UDisk)" option under EFI Boot Devices in the Boot Option Menu! (You need to be registered to view this link, please log-in or register
). I can boot up Win PE and get into Macrium Reflect Free, and I can also use USB keyboard and mouse, plus I can see my Linx 8 MRF backups on the external 2 Tb USB hard drive. I can also still see all these devices from Win 8.1 level on my Linx 8.
This means I should be able to create and restore complete Macrium Reflect Free image backups of all drive partitions on my Linx 8, which was a pre-requisite for me for attempting upgrade to Windows 10, in case all goes belly up, and I need to restore the Linx 8 to Win 8.1.
Note: at the UEFI level, I still had "USB OTG Support"='PCI Mode' and "VBUS"='ON' and I could access all USB devices on the EasyAcc Hub. I tried changing "USB OTG Support" back to it's shipped default value of "Disabled", and I can still access all USB devices on the EasyAcc Hub. HOWEVER, with approach #2, my Linx 8 is no longer charging when at Win 8.1 level (regardless of the "USB OTG Support" setting), whereas when I use the Micro USB B to Standard USB A cable that came with the Linx 8 in step 2b above, the Linx 8 DOES charge when at the Win 8.1 level (also regardless of the "USB OTG Support" setting).
This means that I have to choose which cabling arrangement to use depending on what I am trying to do, namely
A. Linx 8 connected to EasyAcc Hub using Micro USB B to Standard USB A cable that came with the Linx 8: normal operations at Win 8.1 level, with OTG charging of Linx 8 working
B. Linx 8 connected to EasyAcc Hub using both the new Linx 8 OTG Cable and the Standard USB A to Standard USB B cable that came with the EasyAcc Hub: operations performed at UEFI level, with OTG charging of Linx 8 not working (at Win 8.1 level)
I can live with these limitations, though would be nice if I could get OTG charging to work in case B as well
Many thanks for all your inputs!