fs-update error os47.zd

[dfarning at sugarlabs.org]

Last night I just update the firmware on a XO1.5 to Q3A16.

This morning when I try updating to os47.zd from a .zd file on a USB tick I get the following
-----------
ok fs-update u:\os47.zd
SD card did not power up
u:\os47.zd:1 Can't open disk device

WARNING: the file specified 28672 chunk but wrote only 1 chunks
00:00:00
ok
------------

I have never come across that error before.

thanks
david
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