Gateway backup reverse compatibility?

Hi, Can we import a gateway backup of rev 8.1.17 into 8.1.15 ? guess not

Nope. { Technically, you could edit the gwbk file to lie about its version and take your chances. Odds of success are low. }

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Can you please elaborate how to edit the gwbk file to lie about its version ?

Gateway backups are ZIP files. Use a zip tool and poke around at the contents.