SD card issue is resolved. Its able to read in both OS any sd card i threw into the slot, even an obscure branded 128gb sd card.
A system firmware update is required.
Ensure 70% or above battery life and remove any usb devices/power cables. (There are some reports from other users of bricking the tablet during the process if these are not ensured)
Go to Windows device manager -> Firmware -> System firmware
Right click and select update drivers.
It will download the latest firmware. Reboot system when prompted.
Boot to Windows. During loading, the system will perform some bios/firmware updates.
When it prompts for ‘Press any key to reboot’, press any volume keys to reboot the tablet.
Wait for the system to reboot (takes a while) and select Windows again.
Go to device manager -> firmware-> System firmware. The version should now be 3.03.
SD card should now be be readable in both OS.