Important
Coming from 2.15 or earlier? Read the 2.16 notes first: the card layout changed, and the Web Manager has to Organize the card once. Coming from 2.16 there is nothing to reorganise.
A fixes-only release. Nothing on your card changes, and no setting moves.
Fixes
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Guides are back in the in-game menu. Since 2.16 the GUIDES tab said Manual not found for every game, on every console and every chip, even though the same guides were listed on the pre-boot info card and opened fine there (#57).
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Up and Down on the info card step across MSU-1 folders. With Open MSU-1 folders as games on (the default since 2.16.2), moving to the next or previous game from the info card skipped over games that live inside their own MSU-1 folder. It now walks in and out of those folders like any other entry, and going back with B leaves the browser where you were.
Thanks
Thanks to @Kenta-X87 for the detailed report on the guides, with the version comparison that made it reproducible here in minutes.