fb_DKmbO38 replied at 2020-3-18 16:52
https://firmware.gem-flash.com/index.php?a=downloads&b=folder&id=19877

The link from www.needrom.com is also dead.
But from firmware.gem-flash.com it is relevant, although this is a slightly older release.
Thank you very very much!

I've found one more flash file, newer release:
https://www.needrom.com/download/last-original-stock-rom-5-0/

Thanks for the suggestions

boa noite, qual a versao da firmware do DOOGEE N20