Windows tutorial:
- Download rdiff[^1].
- Extract the zip
- Open cmd in the extracted folder by typing
cmd
in the File Explorer address bar and pressing enter - Type
rdiff.exe delta SIGNATURE.sig YOUR_ROM_FILE DIFFERENCE.delta
(replace filenames as appropriate) and press enter - Upload the
DIFFERENCE.delta
file that is created in the folder
Linux/Mac:
rdiff should be available via package manager