This phone:
HM2014811 = WT88047 (Global)
eMMC is SAMSUNG R311MB 16 GB
fastboot devices fastboot reboot-bootloader fsatboot reboot emergency
https://twrp.me/wingtech/wingtechredmi2.html
Fastboot flash recovery TWRP.img
https://stackoverflow.com/questions/42765900/adb-devices-says-unauthorized-in-twrp/48528833
TWRP contains wrong props. Should be:
getprop ro.secure=0 ro.adb.secure=0 ro.debuggable=1
Make dump of main flash region to SD card using TWRP:
dd if=/dev/block/mmcblk0p30 of=/external_sd/dump1.bin bs=1M count=4000 dd if=/dev/block/mmcblk0p30 of=/external_sd/dump2.bin bs=1M count=4000 skip=4000 dd if=/dev/block/mmcblk0p30 of=/external_sd/dump3.bin bs=1M count=4000 skip=8000