It seems that all Windows 10 devices with 16 GB eMMC as C drive are stuck on Windows 10 initial release (10240) and cannot upgrade to TH2 (10586).
The upgrade cannot be done even if external memory is attached, because the update procedure asks for about 5 GB disk space on drive C. Freeing 5 GB on C is unfeasible on those devices.
NB: The updgrade from Win 8.1 to Win 10 went fine with external memory attached and as little as 800 MB free disk space on drice C.
Now presumably hundreds of thousends of Windows 10 devices (mostly tablets and 2-in-1s) are stuck pre TH2.
If there is a way to upgrade (not re-install) those devices, please advise!
Regards,
Revel