hmm, upgrade docs are pretty good, with old code and new code. There is also an upgrader tool that gets you started, https://github.com/silverstripe/silverstripe-upgrader
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if there isn't db details in config.php, and there isn't a __ss_environment.php file, is there anywhere else a SS install will look for those details?
SS4 has .env or Environment Variables, but afaik that's it
i'm looking at somebody's site, can't really see how it's connecting. no _config.php or _ss_environment.php
_ss_environment.php can be above webroot, afaik it scans all dirs up
yeah, i've been rummaging around the server up and up, but without _config.php ?