The Motorola Droid 4 xt894 has a lot of memory space unused splitted in two partitions: /preinstall : 600 Mb /webtop : 1,4 Gb /preinstall is the partition where are stored the preinstalled apps and /webtop is an abandoned partition that under Gingerbread was used for the webtop but since ICS has been abandoned. We could install a rom in these partitions using: /preinstall for /system_2 /webtop for /data_2 sharing the /cache partition between /system_1 and /system_2 BMM is an advanced Recovery based on ClockworkMod natively created for the spyder xt909 but fully working on a lot of Motorola omap4 devices, Droid 4 xt894 included. BMM allows you to install a rom in System_2 using the unused partitions but it uses this layout: it creates a virtual slot in /data/media/virtual/system_1/cache...
