There is no official “1.6.1” or “160 upd” beyond this. Version numbers in BotW follow the pattern 1.0.0 → 1.6.0. The shorthand “160 upd” refers to this specific patch.

The most relevant update corresponding to "160" is the , which was released on April 25, 2019.

The update primarily prepared the game for the and addressed long-standing technical hurdles:

Item, weapon, and inventory behavior

The last official minor update (v1.6.0) primarily focused on technical compatibility, such as VR goggles support and minor bug fixes for DLC content. Troubleshooting Error 160-0103 (Wii U)