After updated to 4.9, my Appearance editor become empty, any if one plugin has problem, I need to disable all the plugin one by one which take really long time and all I just need just update the logo. Do you or can you create a plugin enable and disable button. which can disable/not loading all plug in at once, and enable it again after update. and if test any plugin and cause problem. it will be very useful to bring the site up again.
Read more here:: Disable Plugin with one button