How To easily recover ACF fields from exported PHP file

Prerequisites

1. ACF (and all ACF extensions) should be loaded from functions.php, before acf-recover. Do not try to use ACF as a plugin, otherwise this utility won't play nice.
2. Clone this repo on it's own folder, right into theme directory. The name is not important as long as it have it's own folder.
3. Have your exported fields as acf_export_recover.php located one level upper than this script.
4. Edit acf_export_recover.php and replace all instances of register_field_group with re_register_field_group.
5. This utility assumes you have ACF 4.x. For ACF 5.x, please take a look at this utility

So basically you will have a structure like this:

ThemeDirectory
ThemeDirectory\functions.php
ThemeDirectory\acf_export_recover.php
ThemeDirectory\acf-recovery\*

Set Up

1. In your functions.php file include the recover.php;
2. Access admin with ?recover-acf-fields=1 added in your URL;
3. Do not reload this page, otherwise you will have duplicates;
4. Remove recover.php from functions.php;
5. Enjoy!

Extra tweaking

You can change default entry status (which is draft) and entry title suffix (which is (recover) ) by adding these two filters in your functions.php file:

add_filter( 'acf/import/post_status', function(){ return "publish"; } );
add_filter( 'acf/import/title_suffix', function(){ return ""; } );

Resources

1. ACF Recovery (works only with ACF 3)
2. Lost many fields after import.