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Hello,
I have a few questions:
Best regards,
Žygimantas
Another link, to an even older version to try is here.
Are you sure your device is TRB142 and not 140 as firmware name suggests that it is from 140?
Try the files in this wiki page: https://wiki.teltonika-networks.com/view/TRB142_Legacy_FW_Upgrade_Instructions.
You can also find a similar page for TRB140.