[Xiaomi Mi Pad ROMs, Kernels, Recoveries, & Other D] Cezar`:
I would forget about nvflash for now.

Maybe you should tell us exactly the steps you took before you ended up in this situation.

I reviewed the resize script and it does not touch WB0 (mmcblk0p9)

If you have TWRP you can use the terminal to navigate to /dev/block/platform/sdhci-tegra.3/by-name.

If you run

cd /dev/block/platform/sdhci-tegra.3/by-name && ls -al

you will get all partitions and their block devices.This is the input for my MiPad (ignore the first 5 lines)

__bionic_open_tzdata: couldn't find any tzdata when looking for localtime!
__bionic_open_tzdata: couldn't find any tzdata when looking for GMT!
__bionic_open_tzdata: couldn't find any tzdata when looking for posixrules!
drwxr-xr-x 2 root root 920 Mar 1 11:59 .
drwxr-xr-x 4 root root 700 Mar 1 11:59 ..
lrwxrwxrwx 1 root root 21 Mar 1 11:59 AP1 -> /dev/block/mmcblk0p27
lrwxrwxrwx 1 root root 21 Mar 1 11:59 APP -> /dev/block/mmcblk0p26
lrwxrwxrwx 1 root root 21 Mar 1 11:59 BKB -> /dev/block/mmcblk0p15
lrwxrwxrwx 1 root root 21 Mar 1 11:59 BKC -> /dev/block/mmcblk0p20
lrwxrwxrwx 1 root root 21 Mar 1 11:59 BKD -> /dev/block/mmcblk0p21
lrwxrwxrwx 1 root root 21 Mar 1 11:59 BKE -> /dev/block/mmcblk0p25
lrwxrwxrwx 1 root root 21 Mar 1 11:59 CAC -> /dev/block/mmcblk0p28
lrwxrwxrwx 1 root root 20 Mar 1 11:59 DFI -> /dev/block/mmcblk0p5
lrwxrwxrwx 1 root root 20 Mar 1 11:59 EBT -> /dev/block/mmcblk0p3
lrwxrwxrwx 1 root root 20 Mar 1 11:59 EKS -> /dev/block/mmcblk0p7
lrwxrwxrwx 1 root root 20 Mar 1 11:59 FB -> /dev/block/mmcblk0p8
lrwxrwxrwx 1 root root 21 Mar 1 11:59 LN1 -> /dev/block/mmcblk0p23
lrwxrwxrwx 1 root root 21 Mar 1 11:59 LNX -> /dev/block/mmcblk0p22
lrwxrwxrwx 1 root root 21 Mar 1 11:59 LOG -> /dev/block/mmcblk0p18
lrwxrwxrwx 1 root root 21 Mar 1 11:59 MDA -> /dev/block/mmcblk0p17
lrwxrwxrwx 1 root root 21 Mar 1 11:59 MDM -> /dev/block/mmcblk0p12
lrwxrwxrwx 1 root root 21 Mar 1 11:59 MLO -> /dev/block/mmcblk0p13
lrwxrwxrwx 1 root root 21 Mar 1 11:59 MRO -> /dev/block/mmcblk0p14
lrwxrwxrwx 1 root root 21 Mar 1 11:59 MRW -> /dev/block/mmcblk0p19
lrwxrwxrwx 1 root root 21 Mar 1 11:59 MSC -> /dev/block/mmcblk0p10
lrwxrwxrwx 1 root root 20 Mar 1 11:59 NVC -> /dev/block/mmcblk0p1
lrwxrwxrwx 1 root root 21 Mar 1 11:59 PST -> /dev/block/mmcblk0p16
lrwxrwxrwx 1 root root 20 Mar 1 11:59 RBL -> /dev/block/mmcblk0p4
lrwxrwxrwx 1 root root 20 Mar 1 11:59 RMB -> /dev/block/mmcblk0p2
lrwxrwxrwx 1 root root 21 Mar 1 11:59 SOS -> /dev/block/mmcblk0p24
lrwxrwxrwx 1 root root 20 Mar 1 11:59 TOS -> /dev/block/mmcblk0p6
lrwxrwxrwx 1 root root 21 Mar 1 11:59 UDA -> /dev/block/mmcblk0p29
lrwxrwxrwx 1 root root 21 Mar 1 11:59 USP -> /dev/block/mmcblk0p11
[B][I][COLOR="Red"]lrwxrwxrwx 1 root root 20 Mar 1 11:59 WB0 -> /dev/block/mmcblk0p9[/COLOR][/I][/B]
lrwxrwxrwx 1 root root 20 Mar 1 11:59 aboot -> /dev/block/mmcblk0p3
lrwxrwxrwx 1 root root 20 Mar 1 11:59 aboot1 -> /dev/block/mmcblk0p4
lrwxrwxrwx 1 root root 21 Mar 1 11:59 boot -> /dev/block/mmcblk0p22
lrwxrwxrwx 1 root root 21 Mar 1 11:59 boot1 -> /dev/block/mmcblk0p23
lrwxrwxrwx 1 root root 21 Mar 1 11:59 cache -> /dev/block/mmcblk0p28
lrwxrwxrwx 1 root root 21 Mar 1 11:59 logo -> /dev/block/mmcblk0p18
lrwxrwxrwx 1 root root 20 Mar 1 11:59 microboot -> /dev/block/mmcblk0p1
lrwxrwxrwx 1 root root 20 Mar 1 11:59 microboot1 -> /dev/block/mmcblk0p2
lrwxrwxrwx 1 root root 21 Mar 1 11:59 misc -> /dev/block/mmcblk0p10
lrwxrwxrwx 1 root root 21 Mar 1 11:59 persist -> /dev/block/mmcblk0p16
lrwxrwxrwx 1 root root 21 Mar 1 11:59 recovery -> /dev/block/mmcblk0p24
lrwxrwxrwx 1 root root 21 Mar 1 11:59 staging -> /dev/block/mmcblk0p11
lrwxrwxrwx 1 root root 21 Mar 1 11:59 system -> /dev/block/mmcblk0p26
lrwxrwxrwx 1 root root 21 Mar 1 11:59 system1 -> /dev/block/mmcblk0p27
lrwxrwxrwx 1 root root 21 Mar 1 11:59 userdata -> /dev/block/mmcblk0p29

Try doing the same on yours, or, if you have some experience with adb, you can open a shell straight from your computer while the tablet is in Recovery Mode and connected through USB.

All you need to run in your Elementary is

adb shell

and you'll have access to the root of the tablet. There you can run the command below to see wether WB0 even appears

cd /dev/block/platform/sdhci-tegra.3/by-name && ls -al | grep WB0

I'm curious if this is not simply a symlink issue or maybe the block device just doesnt exist. Or maybe your partition table is completely screwed.

To be sure, run

cd /dev/block/platform/sdhci-tegra.3/by-name && ls -al

and compare the output to the partition table I got from my tablet