there is no cache, just a single apache server. as I said, restarting the php daemon or going to the individual page purge endpoint.

In T143852#2582237, @Ciencia_Al_Poder wrote:

maintenance/update.php is for upgrading MediaWiki or adding a new extension that requires it, it shouldn't be used for this.

I'm a bit confused, you say the page contains both the text "No file by this name exists." and "Importing file"? Where in the page does "Importing file" appear?

By "cache=accel" do you mean setting $wgMainCacheType = CACHE_ACCEL?