Failed to load save: reencode mismatch
The real fix

Someone posts this error about once a week, and the stock reply — "update the editor" — is right often enough that it became gospel, and wrong often enough that people burn an evening on it anyway. I watched one guy's video where he'd been at it for five hours. So let me give you the actual fix that works most of the time first, then explain the cases where it doesn't and what to do instead.

That clears it for most people, because most people are running an old build. If you already did that and you're still stuck, keep reading — your cause is one of the other two, and they have different answers.

What "reencode mismatch" actually means

Here's the plain-English version. When you open a save, Gibbed decodes it into something it can show you. When you hit save, it has to re-encode that back into the game's format. As a safety check, it re-encodes the file the moment it loads and compares the result to the original. If the two don't match byte-for-byte, it refuses to go further and throws this error — because if it can't reproduce your save exactly, it can't trust itself to write it back without corrupting it.

So the error isn't really "your save is broken." It's the editor saying "I don't fully understand this save's format, and I'd rather stop than wreck it." Which is honestly the behavior you want. The question is why it doesn't understand the format — and there are three answers.

Cause 1: your editor is older than your save

This is the big one, the reason the quick fix works so often. Borderlands 2 got patched over the years, and some patches nudged the save format. An editor build from 2015 — say one of those "r256" copies floating around on mirrors — can read an old save fine but chokes when it tries to re-encode a save that a newer game patch touched. The format moved; the editor didn't.

Official 1.0.46 from May 2020 is current with the live game. If you got your editor anywhere other than GitHub, or you're not sure what version it is, assume this is your problem and do the clean reinstall below.

Cause 2: the Community Patch changed your items

This one trips up exactly the people who've already updated their editor, so they're convinced the quick fix failed. If you run the Unofficial Community Patch (UCP) or a similar community patch, it adds and tweaks items the base game never had. A save that's been played with the patch can contain gear the stock editor doesn't recognize — and re-encoding gear it doesn't understand is exactly what triggers the mismatch.

Cause 3: a half-downloaded or mangled editor

Less common, but it happens: the zip didn't finish downloading, or you extracted it halfway, or you dragged the exe out of the folder and left its DLLs behind. A broken editor install can throw this too. The clean reinstall fixes it the same way it fixes Cause 1 — that's why I always start there.

The tell: one save opens, another doesn't

Here's the diagnostic that saves you guessing. If some of your characters open in Gibbed but one specific save — usually your newest, the one you actually care about — throws the mismatch, that asymmetry is the answer. It's not a broken editor (a broken editor fails on everything). It's that the failing save has something the others don't: a newer format from a recent play session, or community-patch items. People file this exact scenario constantly — "my 2015 characters load, my new one won't." Same root cause every time.

The clean reinstall, step by step

1. Check what you've actually got

   If the editor didn't come from GitHub, or it's older than 1.0.46, that's almost certainly it. The official maximum is 1.0.46, dated May 30, 2020.

2. Wipe and re-pull

   Delete the old folder entirely. Download bl2_saveedit_1.0.46.zip from the verified release and extract everything into a fresh, empty folder. Don't merge it into the old install — start clean.

3. Open with the right platform

   In the Open dialog pick PC for a Steam or Epic save. If it's a console save, picking PC (or skipping the decrypt step) gives you the neighboring invalid SHA1 hash error instead — different problem, different fix.

If it still won't load

• It's a console save (you pulled it off a PS3/PS4/Xbox) → it's encrypted, and that's the SHA1 hash problem, not this one. Re-encode mismatch on console saves usually means the decrypt/resign step went sideways.
• You're on the Community Patch → see Cause 2. Try a vanilla character, or expect patch-only items not to round-trip.
• The save is genuinely corrupted (the game crashed mid-save) → check for a .bak file next to it or a Steam Cloud copy. I cover both in save location & backups.