# How to update Komodo (for Notary Nodes)¶

Reboot your node (to start clean).

Please follow each step carefully and don’t skip to the next one until the previous step is successfully completed. If you have the komodo daemon running, you can leave it running while updating if you have enough resources in your machine. If you prefer to stop it before updating, please use ~/komodo/src/komodo-cli stop to stop the daemon and proceed with the following steps to update.

1. Navigate to your komodo directory
cd ~/komodo

1. Make sure you don’t have any changes made to the source and reset it. This will ensure clean source and shouldn’t create issues while pulling the latest source in the next step.
git reset --hard

1. Clean the source directory
make clean

1. Update the source. (If you have any changes made to the source code, this command may not pull the latest source. Please make sure you have followed the previous steps)
git pull

1. Compile the latest binary
./zcutil/build.sh -j\$(nproc)


Start your sevices as usual. If you didn’t stop the deamon before compiling, please stop it using ~/komodo/src/komodo-cli stop and start again.

After that, go to your .komodo folder

cd ~/.komodo


Remove the following files

rm -rf blocks chainstate debug.log komodostate db.log


Go back to you home folder

cd ~


./start


Let it resync (check with the getinfo command). When it is done resync, start Iguana

cd ~/KomodoPlatform/iguana
./m_notary


Your Komodo installation is now uptodate.

## Problems?¶

I receive the following error when i do ./zcutil/build.sh -j8

EXCEPTION: St13runtime_error
could not load param file at /home/j/.zcash-params/sprout-verifying.key
Komodo in AppInit()


You have to do ./zcutil/fetch-params.sh first and after that ./zcutil/build.sh -j8