To understand the update, we must first break down the filename itself. CD Projekt Red (CDPR) and its distribution partners use a specific naming convention for regional patches.
In plain English: NSPUSUpdate 404b is the second iteration of the hotfix for the North American version of The Witcher 3's Next-Gen Edition (Patch 4.04).
Disclaimer: This guide is for informational and preservation purposes. Modifying your Nintendo Switch or using unauthorized NSP files violates Nintendo’s Terms of Service and may lead to console bans. Only install updates you legally own.
If you own a legitimate copy of The Witcher 3: Wild Hunt – Complete Edition (US digital or cartridge) and have a homebrewed Switch, here’s a general workflow to apply an NSP update like 404b: the witcher 3 wild hunt nspusupdate 404b
You own the original North American Witcher 3 discs (Base + Hearts of Stone + Blood and Wine). Your console or PC drive reads version 1.00 or 4.00. The automatic update servers are slow. Installing NSPUSUpdate 404b manually will jump you directly to the stable 4.04b build without downloading 30GB of incremental history.
The scene group “SUXXORS” (notorious for repacking Switch updates) released a file in late 2024 labeled The_Witcher_3_Wild_Hunt_Complete_Edition_US_Update_404b_NSW-SUXXORS. The “b” likely stood for “build b” – a revision of their internal repack after a failed upload of 4.04a. Some download sites then mislabeled it as an official patch.
Another possibility: a modder by the handle “MephistoSwitch” created an IPS patch to convert 4.04 into 404b, adding a custom configuration menu. That IPS patch was then merged into a full NSP and redistributed. To understand the update, we must first break
Without a definitive scene release note, 404b remains an anomaly – neither official nor entirely fake, but rather a Frankenstein’s patch of legitimate code and hobbyist edits.
As of the writing of this article, NSPUSUpdate 404b is the most stable release of The Witcher 3 for PC and North American consoles. CDPR has officially moved on to development of The Witcher 4 (Project Polaris).
There will be no 404c or 405. The 4.04b mark is the end of the line. This means: In plain English: NSPUSUpdate 404b is the second
Even with a clean install, you may encounter issues. Here are the fixes for the top three problems reported with this specific patch.
NSP files are used by the Nintendo Switch to distribute and install games and updates. When updating a game, the system typically downloads an NSP file and then installs it. If you're referring to a specific NSP file (like a v404b update), it's likely a versioned update package.
You are using script-heavy mods like Brothers in Arms or W3EE Redux. These mods often require a specific file signature from the witcher3.exe. If your game version shows "4.04.404b" in the main menu, you have a different checksum than someone on "4.04.404a". To ensure your mod merges work correctly with the community patch, you must match your update to the version the mod author used.