What device you are using? It can not copy data to internal emmc as it’s read only.
And when you upgrade CE by tar file when booted from eMMC? Is the update working?
The information I found about this error:
The messages to me suggest either
a) a faulty piece of hardware
or
b) a low-level driver at fault
or
c) a USB disconnect caused by the HDD itself ...
So I guess it’s answer a).
@boot2k3 Can it be the eMMC sdio speed?
Also please remember your devices aren’t official supported: