This rule addresses a one-byte defect only in the terminal |-DESMUME SAVE-| marker. The fixed DSV footer prefix must already be exact. SaveEditor restores exactly one cookie mismatch in a new copy, requires the existing strict DSV footer validator to accept the result, and verifies that extracting the reconstructed DSV returns the source raw-save region byte-for-byte.
Emulator & Retro Tools
DeSmuME DSV Cookie Recovery
Restore exactly one damaged byte in the terminal DeSmuME DSV cookie only when the fixed footer prefix is intact and raw save bytes remain exactly unchanged.
01 / Tool workbench
Use the runtime only when it is actually ready.
The application shell fails closed. An input interface is not enabled merely because a WordPress Tool record exists; the declared engine must be registered in the current build.
Session change summary
No output has been built in this session.
02 / Compatibility
Know the supported input before opening a file.
Compatibility fields are intentionally explicit. Missing values stay unclaimed rather than being filled with generic assumptions.
Accepted extensions
.dsv
Platforms
Nintendo DS
Supported versions / editions
DeSmuME DSV battery-save containers using the footer structure already verified by the Phase 36 converter.
Input constraints
Non-empty raw region plus complete documented footer; exact fixed DeSmuME footer prefix; exactly one mismatch in the terminal cookie; strict DSV validation after reconstruction; raw save region remains identical.
Known limitations
No prefix repair in the same operation, no metadata-field synthesis, no multiple-cookie-byte recovery, no payload edit, no save-state handling, and no changes outside one cookie byte.
Output / result
A new DSV copy differing from the source at exactly one terminal cookie byte, with raw save bytes preserved exactly.
03 / Instructions
Use a reversible workflow.
File-oriented workflows start with an untouched original. Tool-specific instructions add only details documented for this utility.
- 01Keep the original
Preserve an untouched copy before creating or transforming binary output.
- 02Confirm scope
Match the file size, format, platform, and version to the support information on this page.
- 03Process locally
Use the runtime only when the page reports that its declared engine is loaded.
- 04Validate output
Compare or test the result before replacing any working source file.
Tool-specific steps
Select the damaged DSV. SaveEditor must prove the prefix is intact, exactly one cookie byte differs, and strict footer/raw extraction succeeds after reconstruction before download is enabled.
04 / Privacy and processing
The processing mode is part of the product contract.
SaveEditor.com should state local processing only when the implementation truly keeps file contents in the browser. Server or hybrid processing must be disclosed just as clearly.
Declared mode
Browser local
Runtime state
Operational
Tool-specific privacy notes
Phase 52 reads only the explicitly selected local file in the browser. The nintendo-recovery-v1 runtime contains no fetch, XMLHttpRequest, WebSocket, sendBeacon, form upload, server-side save processing, or telemetry path. The permanent 16 MiB per-file ceiling remains in force and the selected source is never modified.
05 / Troubleshooting
When a file is rejected, do not force it.
A rejection can indicate an unsupported size, format, version, platform, or byte sequence. Preserve the original and correct the input instead of bypassing validation.
Re-check the documented input type and browser size limit before retrying.
A generic converter does not imply support for every game-specific container, signing scheme, or serialization format.
Return to the untouched source instead of repeatedly processing a damaged or partially transformed file.
Known Tool issues
If the prefix is damaged or more than one cookie byte differs, this profile refuses output. Preserve the source and use the matching narrow profile only if its independent predicates hold.
06 / Verification
Support claims should be traceable.
The verification date, method notes, and public references are kept separate from marketing language so compatibility can be reviewed over time.
Last verified2026-08-10
Profiledesmume-dsv-cookie-recovery
Method notes
Verified with deterministic DSV fixtures, every one-byte cookie corruption, exact-prefix gating, zero/multi-byte refusal, raw-region equality, strict footer reopen, independent reconstruction, and full regression/source-package parity.
07 / FAQ
Questions to answer before editing.
These answers are generated from the Tool record and current runtime state rather than generic compatibility promises.
Is DeSmuME DSV Cookie Recovery ready to use?
The Tool record is verified and declares an operational runtime. The page enables its input controls only when the declared engine module is loaded in the current build.
Does processing stay in the browser?
Yes for this declared mode. The loaded runtime processes the explicit input in the browser; Tool-specific privacy notes describe the exact scope and limits.
Should I keep the original file?
Yes. Keep an untouched source file until any generated output has been validated.
What if my input is rejected?
Use the validation message to correct the base, encoding, width, timezone, byte alignment, or size. The runtime does not guess through invalid input.
Related tools
Continue with the same tool family.
Only index-ready verified records from the same Tool Family are shown here.