Manually Swap External SD to Internal SD, 5.1.1 Lollipop After Root?

Alcatel OneTouch Elevate

Hardware : Qualcomm
Model : 5017B
Build number : Android L
Build date UTC : 20150725-065328
Android v : 5.1.1

file being modified: vold.fstab

code to be modified:

dev_mount sdcard /storage/sdcard1 auto /devices/msm_sdcc.2/mmc_host

#MTP
#dev_mount sdcard2 /mnt/sdcard/external_sd auto /devices/platform/msm_sdcc.3/mmc_host


Should I swap out the highlighted red text in each line, or perhaps it is another section of each line? Or is storage mount embedded in the ROM, which would require opening the ROM and editing it then repacking it (which no one can do right now, no means of backing up full ROM)?

Is it even possible to modify these lines in Lollipop 5.1.1 without bricking an Alcatel OT Elevate that's rooted? There is no recovery possible for this device at present. No custom ROMs, and no custom recovery to flash with. This phone is mysterious, has a hidden fastboot partition, looks like.

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