It is, let's say, tricky.
Maybe you on an old FW Version that need an Internet Connection to set the System Time, otherwise the verification failed.
See older Posts similar to this issue below:
Upgrade UL3 firmware from 5.2.8 to 5.2.11 from USB not working
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Robbbbb 0
An update here:
We managed to establish an ethernet-connection to the S5
The system time on the s5 is 01.January 1970 which might be the reason, that the new firmware fails to verify.
Unfortunately the S5 makes no effort to synchronize the time, so all attempts to update continue to fail.
Also in the webinterface on the ethernet connected laptop, the 5.1.93.20190313 firmware is shown as actual one with the update button greyed out.
I guess I'd need a step stone firmware that even works in the 1970s.
Please help.
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