So, in order for you to use your external SD card to save apps, this should be the trick
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## Vold 2.0 Generic fstab
## - San Mehat (san@android.com)
##
#######################
## Regular device mount
##
## Format: dev_mount <label> <mount_point><part> <sysfs_path1...>
## label - Label for the volume
## mount_point - Where the volume will be mounted
## part - Partition # (1 based), or 'auto' for first usable partition.
## <sysfs_path> - List of sysfs paths to source devices
######################
## Example of a standard sdcard mount for the emulator / Dream
# Mounts the first usable partition of the specified device
dev_mount sdcard /mnt/sdcard2 emmc@fat /devices/platform/goldfish_mmc.0 /devices/platform/mtk-sd.0/mmc_host
dev_mount sdcard /mnt/sdcard auto /devices/platform/goldfish_mmc.1 /devices/platform/mtk-sd.1/mmc_host
## Example of a dual card setup
# dev_mount left_sdcard /mnt/sdcard1 auto /devices/platform/goldfish_mmc.0 /devices/platform/mtk-sd.0/mmc_host/mmc0
#
dev_mount right_sdcard /mnt/sdcard2 auto /devices/platform/goldfish_mmc.1 /devices/platform/mtk-sd.2/mmc_host/mmc2
## Example of specifying a specific partition for mounts
# dev_mount sdcard /mnt/sdcard 2 /devices/platform/goldfish_mmc.0 /devices/platform/msm_sdcc.2/mmc_host/mmc1
Play close attention to these 2 lines. The one below is my EDITED one.
CODE
dev_mount sdcard /mnt/sdcard2 emmc@fat /devices/platform/goldfish_mmc.0 /devices/platform/mtk-sd.0/mmc_host
dev_mount sdcard /mnt/sdcard auto /devices/platform/goldfish_mmc.1 /devices/platform/mtk-sd.1/mmc_host
The original one should look like this
CODE
dev_mount sdcard /mnt/sdcard emmc@fat /devices/platform/goldfish_mmc.0 /devices/platform/mtk-sd.0/mmc_host
dev_mount sdcard /mnt/sdcard2 auto /devices/platform/goldfish_mmc.1 /devices/platform/mtk-sd.1/mmc_host
At the dev_mount sdcard /mnt/sdcard, swap the sdcard2 from below to top. Then reboot your phone. The primary SD card should now be your external SD card.
DO NOT TRY IF YOU HAVE NO IDEA WHAT YOU ARE DOING. I WILL NOT BE HELD RESPONSIBLE IF YOU SCREW UP YOUR PHONE.