Hello to all, I found out that you must perform two steps in order to make this them work with SPRecovery: 1.- Replace the META-INF folder located in the zip with one created and working with SPRecovery (it could actually be one from another theme). 2.- Create a folder and name it system; then, place the app, fonts, framework, and media folders in it (in this theme they are outside when they should be in). Of course, you need to use 7zip to do this without changing the properties of the update.zip **Try this at your own risk** Good luck