1, the original file b2b site, in addition to data, archiver, attachment, configs directories, all folders and files are moved to the new folder (such as oldb2b) Lane;
2, will download the same encoding (eg utf-8 utf-8 package to download) 4.0 installation file after decompression in the upload directory, in addition to api, configs directory, other directories unified uploaded to the server, if it says “if Coverage “, the choice is;
3, uploaded, will be installed package of upgrade/upgrade34to40.php uploaded to the server, and run
4 When prompted, the upgrade
5, if the upgrade fails, restore the original file to oldb2b directory, there are technical problems, please visit the official forum.