README.md

NSP Update Patcher

Instructions:

1. Place your base NSP, update NSP, and prod.keys into a new folder
2. Open a terminal and cd into this folder
3. Download and run script:

curl -o nsp_update_patcher.sh https://gist.githubusercontent.com/willfaust/fb90dec409b8918290012031f09a78ef/raw/9abf2e1b020203aec0051fad99524f8269cb1edd/nsp_update_patcher.sh && chmod +x nsp_update_patcher.sh && ./nsp_update_patcher.sh

---

Notice:

• This script assumes that the larger NSP is the base, and the smaller NSP is the update
• Your free drive space should be at least three times the size of your base and update NSPs combined
• You must have your product keys dumped from your switch

Credit to hactool and hacPack

nsp_update_patcher.sh

# find base and update NSPs
basensp=$(ls -S *.nsp | head -1)
updatensp=$(ls -Sr *.nsp | head -1)

# clone and build hactool and hacpack
git clone https://github.com/SciresM/hactool
mv hactool hactoolsrc
cd hactoolsrc
mv config.mk.template config.mk
make
mv hactool ..
cd ..
rm -rf hactoolsrc

git clone https://github.com/The-4n/hacPack
mv hacPack hacpacksrc
cd hacpacksrc
mv config.mk.template config.mk
make
mv hacpack ..
cd ..
rm -rf hacpacksrc

mkdir -p ~/.switch
cp prod.keys ~/.switch
touch ~/.switch/title.keys

mkdir temp hactool_out
cd hactool_out

# derive title keys from base and update NSPs
derivekey () {
	title=$(xxd *.tik | grep -oP -m 1 "(?<=2a0: ).{39}" | sed 's/ //g')
	key=$(xxd *.tik | grep -oP -m 1 "(?<=180: ).{39}" | sed 's/ //g')
	sed -i "/$title=$key/d" ~/.switch/title.keys
	echo $title=$key >> ~/.switch/title.keys
}
../hactool -t pfs0 "../$basensp" --outdir .
derivekey
rm *
../hactool -t pfs0 "../$updatensp" --outdir .
derivekey
rm *

# extract base NSP and move program NCA to temp dir
../hactool -t pfs0 "../$basensp" --outdir .
for i in *.nca
do
	type=$(../hactool $i | grep -oP "(?<=Content Type:\s{23}).*")
	if [ $type == "Program" ]; then
		basenca=$i
		mv $i ../temp
	fi
done
rm *

# extract update NSP and move program & control NCAs to temp dir
../hactool -t pfs0 "../$updatensp" --outdir .
for i in *.nca
do
	type=$(../hactool $i | grep -oP "(?<=Content Type:\s{23}).*")
	if [ $type == "Program" ]; then
		updatenca=$i
		mv $i ../temp
	elif [ $type == "Control" ]; then
		controlnca=$i
		mv $i ../temp
	fi
done
rm *

cd ..
rm -rf hactool_out

mv hactool temp/
mv hacpack temp/
cd temp

# parse Title ID from base program NCA
titleid=$(./hactool $basenca | grep -oP "(?<=Title ID:\s{27}).*")

# extract base and update NCAs into romfs end exefs
mkdir exefs romfs
./hactool --basenca="$basenca" $updatenca --romfsdir="romfs" --exefsdir="exefs"
rm $basenca $updatenca

# pack romfs and exefs into one NCA
mkdir nca
./hacpack --type="nca" --ncatype="program" --plaintext --exefsdir="exefs" --romfsdir="romfs" --titleid="$titleid" --outdir="nca"
patchednca=$(ls nca)
mv $controlnca nca
rm -rf exefs romfs

# generate meta NCA from patched NCA and control NCA
./hacpack --type="nca" --ncatype="meta" --titletype="application" --programnca="nca/$patchednca" --controlnca="nca/$controlnca" --titleid="$titleid" --outdir="nca"

# pack all three NCAs into an NSP
mkdir nsp
./hacpack --type="nsp" --ncadir="nca" --titleid="$titleid" --outdir="nsp"

cd ..
mv temp/nsp/$titleid.nsp ./$titleid[patched].nsp
rm -rf temp

Error when running it, appears to be working, but then it starts displaying "Saving romfs..." "Failed to open romfs!" in a loop one behind the other, never ending, and it makes me terminate it with "Ctrl + C". I tried runing it with Sudo, using "Bash" instead of "./" and giving the .sh permission with "chmod +x". Any suggestion??

Pd: The game is South Park: The stick of truth, and the update is smaller than the base game.