Stefan Agner 55c9b54b13 Check if Busybox supports oflag (#1692) (#1694) ...

* Check if Busybox supports oflag

It seems that Busybox' dd shipped with OS release 5 and earlier does not
support oflag. Check if the flag is supported before making use of it.

* Exit if a command in the update scripts returns an error

This makes sure that the update isn't marked as successful in case there
is an error in the update script.

2021-12-27 14:58:19 +01:00

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