[LeEco Le Max 2 Questions & Answers] A.N.Droid:
here´s the patition table, if it is of any use for you...

lrwxrwxrwx 1 root root 16 Jan 1 00:12 aboot -> /dev/block/sde16

lrwxrwxrwx 1 root root 16 Jan 1 00:12 abootbak -> /dev/block/sde17

lrwxrwxrwx 1 root root 16 Jan 1 00:12 apdp -> /dev/block/sde29

lrwxrwxrwx 1 root root 16 Jan 1 00:12 bluetooth -> /dev/block/sde22

lrwxrwxrwx 1 root root 16 Jan 1 00:12 boot -> /dev/block/sde18

lrwxrwxrwx 1 root root 15 Jan 1 00:12 bootconfig -> /dev/block/sdf7

lrwxrwxrwx 1 root root 15 Jan 1 00:12 cache -> /dev/block/sda3

lrwxrwxrwx 1 root root 15 Jan 1 00:12 cdt -> /dev/block/sdd2

lrwxrwxrwx 1 root root 16 Jan 1 00:12 cmnlib -> /dev/block/sde25

lrwxrwxrwx 1 root root 16 Jan 1 00:12 cmnlib64 -> /dev/block/sde27

lrwxrwxrwx 1 root root 16 Jan 1 00:12 cmnlib64bak -> /dev/block/sde28

lrwxrwxrwx 1 root root 16 Jan 1 00:12 cmnlibbak -> /dev/block/sde26

lrwxrwxrwx 1 root root 15 Jan 1 00:12 ddr -> /dev/block/sdd3

lrwxrwxrwx 1 root root 15 Jan 1 00:12 devcfg -> /dev/block/sda6

lrwxrwxrwx 1 root root 15 Jan 1 00:12 devcfgbak -> /dev/block/sda7

lrwxrwxrwx 1 root root 16 Jan 1 00:12 devinfo -> /dev/block/sde21

lrwxrwxrwx 1 root root 16 Jan 1 00:12 dip -> /dev/block/sde14

lrwxrwxrwx 1 root root 16 Jan 1 00:12 dpo -> /dev/block/sde31

lrwxrwxrwx 1 root root 16 Jan 1 00:12 dsp -> /dev/block/sde13

lrwxrwxrwx 1 root root 15 Jan 1 00:12 factory -> /dev/block/sdf6

lrwxrwxrwx 1 root root 15 Jan 1 00:12 frp -> /dev/block/sda8

lrwxrwxrwx 1 root root 15 Jan 1 00:12 fsc -> /dev/block/sdf5

lrwxrwxrwx 1 root root 15 Jan 1 00:12 fsg -> /dev/block/sde7

lrwxrwxrwx 1 root root 15 Jan 1 00:12 fsg_gap -> /dev/block/sde8

lrwxrwxrwx 1 root root 15 Jan 1 00:12 hyp -> /dev/block/sde5

lrwxrwxrwx 1 root root 15 Jan 1 00:12 hypbak -> /dev/block/sde6

lrwxrwxrwx 1 root root 16 Jan 1 00:12 kernellog -> /dev/block/sdf14

lrwxrwxrwx 1 root root 16 Jan 1 00:12 keymaster -> /dev/block/sde23

lrwxrwxrwx 1 root root 16 Jan 1 00:12 keymasterbak -> /dev/block/sde24

lrwxrwxrwx 1 root root 15 Jan 1 00:12 keystore -> /dev/block/sda5

lrwxrwxrwx 1 root root 16 Jan 1 00:12 letvconfig -> /dev/block/sdf10

lrwxrwxrwx 1 root root 16 Jan 1 00:12 letveui -> /dev/block/sdf11

lrwxrwxrwx 1 root root 16 Jan 1 00:12 letvreserve -> /dev/block/sdf13

lrwxrwxrwx 1 root root 16 Jan 1 00:12 letvsecure -> /dev/block/sdf12

lrwxrwxrwx 1 root root 16 Jan 1 00:12 mdtp -> /dev/block/sde15

lrwxrwxrwx 1 root root 15 Jan 1 00:12 misc -> /dev/block/sda4

lrwxrwxrwx 1 root root 16 Jan 1 00:12 modem -> /dev/block/sde12

lrwxrwxrwx 1 root root 15 Jan 1 00:12 modemst1 -> /dev/block/sdf1

lrwxrwxrwx 1 root root 15 Jan 1 00:12 modemst1_gap -> /dev/block/sdf2

lrwxrwxrwx 1 root root 15 Jan 1 00:12 modemst2 -> /dev/block/sdf3

lrwxrwxrwx 1 root root 15 Jan 1 00:12 modemst2_gap -> /dev/block/sdf4

lrwxrwxrwx 1 root root 16 Jan 1 00:12 msadp -> /dev/block/sde30

lrwxrwxrwx 1 root root 15 Jan 1 00:12 persist -> /dev/block/sda2

lrwxrwxrwx 1 root root 16 Jan 1 00:12 pmic -> /dev/block/sde10

lrwxrwxrwx 1 root root 16 Jan 1 00:12 pmicbak -> /dev/block/sde11

lrwxrwxrwx 1 root root 16 Jan 1 00:12 recovery -> /dev/block/sde20

lrwxrwxrwx 1 root root 15 Jan 1 00:12 recoveryconfig -> /dev/block/sdf9

lrwxrwxrwx 1 root root 15 Jan 1 00:12 reserve -> /dev/block/sdd1

lrwxrwxrwx 1 root root 15 Jan 1 00:12 rootconfig -> /dev/block/sdf8

lrwxrwxrwx 1 root root 15 Jan 1 00:12 rpm -> /dev/block/sde1

lrwxrwxrwx 1 root root 15 Jan 1 00:12 rpmbak -> /dev/block/sde2

lrwxrwxrwx 1 root root 15 Jan 1 00:12 sec -> /dev/block/sde9

lrwxrwxrwx 1 root root 16 Jan 1 00:12 splash -> /dev/block/sde32

lrwxrwxrwx 1 root root 15 Jan 1 00:12 ssd -> /dev/block/sda1

lrwxrwxrwx 1 root root 16 Jan 1 00:12 sti -> /dev/block/sde33

lrwxrwxrwx 1 root root 16 Jan 1 00:12 system -> /dev/block/sde19cmd

lrwxrwxrwx 1 root root 15 Jan 1 00:12 xblbak -> /dev/block/sdc1

never blank partitions if you don´t have a backup anywhere, meaning: not part of qfil, stockrom customrom (zip or fastboot), not pulled from the/a phone(x820/29)

i would pull any single partitiom first (that are not part of roms etc.) and save it, you shoud be safe to restore the phone to the condidtion as it is now at least.

if you think one of theese could cause the problem, be sure to get the partition images from a working phone before you erase those!

also, backup your efs/qcn!

from what you tell it sounds like a harrdware fault but try! i would also try everything, had success the last time.

it bet it´s a x829, isn´t it?

i have some spare time the rest of the week and already helpded some xda users remotely. if you want i could (try) to help you too.

i´m an it guy, so this is my nature.

good luck