# Patching

## Browser path

1. Open `https://xenosaga.wolken.page/`.
2. Select the clean Japanese `Xenosaga I+II` Nintendo DS ROM.
3. The browser checks the source SHA-256 locally.
4. Only the exact supported source is accepted.
5. The public RC1 BPS patch is downloaded and its SHA-256 verified.
6. BPS is applied in a local Web Worker.
7. BPS CRC32 checks are verified.
8. The generated ROM SHA-256 must equal the canonical RC1 target hash.
9. Only then is the download button enabled.

No ROM bytes are posted to a server.

## Traditional BPS path

Download `assets/patch/xenosaga_i_ii_ds_rough_english_v0.1-rc1.bps` and apply it with Floating IPS or another standards-compliant BPS patcher.

Supported source SHA-256:
`938d07521cfc937d179402e85c8b0b43f3e929a494838ff1455b29126b56d356`

Expected output SHA-256:
`67c0fe831083ccfe2da21768fecafd31fb68b7e809964157d175147b3f3f1db1`

## Mobile limitation

The patching operation keeps a 64 MiB source ROM, approximately 54 MiB BPS patch and 64 MiB output in browser memory, plus temporary hashing/runtime overhead. Modern mobile browsers may succeed, but low-memory Safari sessions are not guaranteed. Desktop Chrome, Edge or Firefox is the recommended fallback if a mobile browser terminates the operation.