If you need to update Magento 2 Facebook Pixel by Magefan, please follow the steps below. Note that the update instructions depend on the method the Facebook Pixel extension was installed with.

Update using composer (Method 1)

If the Facebook Pixel module was installed via the composer (check if vendor/magefan/module-facebook-pixel folder exists), then you need to run these simple CLI commands in Magento 2 directory:

composer remove magefan/module-facebook-pixel
composer require magefan/module-facebook-pixel ^x.x.x
# replace x.x.x with the version you want to use
php bin/magento setup:upgrade
php bin/magento setup:di:compile
php bin/magento setup:static-content:deploy

Update using FTP  (Method 2)

If the Facebook Pixel module was installed via FTP (check if app/code/Magefan/FacebookPixel folder exists), then follow these commands:

1. Download the latest version of the Facebook Pixel extension archive from magefan.com.

2. Extract archive.

3. Make the backup copy of the app/code/Magefan/FacebookPixel folder on your server and then remove it.

4. Using FTP, copy the app and lib folders from the archive to your Magento 2 Directory. 

magento 2 Extension Installation

5. Run update CLI commands in Magento 2 directory:

php bin/magento setup:upgrade
php bin/magento setup:di:compile
php bin/magento setup:static-content:deploy