[YotaPhone 3 ROMs, Kernels, Recoveries, & Other Dev] joygram:
if you want dump rom

first unlock boot loader yotaphone.

yota's boot loader unlock is simple. but all data lost.

and enter twrp recovery mode.

you can dump with adb shell dd command.

yota's partition like this.

/dev/block/bootdevice/by-name/

lrwxrwxrwx 1 root root 21 Mar 14 08:15 aboot -> /dev/block/mmcblk0p20
lrwxrwxrwx 1 root root 21 Mar 14 08:15 abootbak -> /dev/block/mmcblk0p21
lrwxrwxrwx 1 root root 21 Mar 14 08:15 apdp -> /dev/block/mmcblk0p47
lrwxrwxrwx 1 root root 21 Mar 14 08:15 boot -> /dev/block/mmcblk0p22
lrwxrwxrwx 1 root root 21 Mar 14 08:15 cache -> /dev/block/mmcblk0p26
lrwxrwxrwx 1 root root 21 Mar 14 08:15 cdt -> /dev/block/mmcblk0p15
lrwxrwxrwx 1 root root 21 Mar 14 08:15 cmnlib -> /dev/block/mmcblk0p41
lrwxrwxrwx 1 root root 21 Mar 14 08:15 cmnlib64 -> /dev/block/mmcblk0p43
lrwxrwxrwx 1 root root 21 Mar 14 08:15 cmnlib64bak -> /dev/block/mmcblk0p44
lrwxrwxrwx 1 root root 21 Mar 14 08:15 cmnlibbak -> /dev/block/mmcblk0p42
lrwxrwxrwx 1 root root 21 Mar 14 08:15 config -> /dev/block/mmcblk0p30
lrwxrwxrwx 1 root root 21 Mar 14 08:15 custom -> /dev/block/mmcblk0p52
lrwxrwxrwx 1 root root 21 Mar 14 08:15 ddr -> /dev/block/mmcblk0p16
lrwxrwxrwx 1 root root 21 Mar 14 08:15 devcfg -> /dev/block/mmcblk0p10
lrwxrwxrwx 1 root root 21 Mar 14 08:15 devcfgbak -> /dev/block/mmcblk0p11
lrwxrwxrwx 1 root root 21 Mar 14 08:15 devinfo -> /dev/block/mmcblk0p25
lrwxrwxrwx 1 root root 21 Mar 14 08:15 dip -> /dev/block/mmcblk0p35
lrwxrwxrwx 1 root root 21 Mar 14 08:15 dpo -> /dev/block/mmcblk0p49
lrwxrwxrwx 1 root root 21 Mar 14 08:15 dsp -> /dev/block/mmcblk0p12
lrwxrwxrwx 1 root root 20 Mar 14 08:15 fsc -> /dev/block/mmcblk0p2
lrwxrwxrwx 1 root root 21 Mar 14 08:15 fsg -> /dev/block/mmcblk0p17
lrwxrwxrwx 1 root root 21 Mar 14 08:15 junklog -> /dev/block/mmcblk0p51
lrwxrwxrwx 1 root root 21 Mar 14 08:15 keymaster -> /dev/block/mmcblk0p45
lrwxrwxrwx 1 root root 21 Mar 14 08:15 keymasterbak -> /dev/block/mmcblk0p46
lrwxrwxrwx 1 root root 21 Mar 14 08:15 keystore -> /dev/block/mmcblk0p29
lrwxrwxrwx 1 root root 21 Mar 14 08:15 letvconfig -> /dev/block/mmcblk0p50
lrwxrwxrwx 1 root root 21 Mar 14 08:15 limits -> /dev/block/mmcblk0p33
lrwxrwxrwx 1 root root 21 Mar 14 08:15 lksecapp -> /dev/block/mmcblk0p39
lrwxrwxrwx 1 root root 21 Mar 14 08:15 lksecappbak -> /dev/block/mmcblk0p40
lrwxrwxrwx 1 root root 21 Mar 14 08:15 logdump -> /dev/block/mmcblk0p53
lrwxrwxrwx 1 root root 21 Mar 14 08:15 mcfg -> /dev/block/mmcblk0p38
lrwxrwxrwx 1 root root 21 Mar 14 08:15 mdtp -> /dev/block/mmcblk0p36
lrwxrwxrwx 1 root root 21 Mar 14 08:15 misc -> /dev/block/mmcblk0p28
lrwxrwxrwx 1 root root 20 Mar 14 08:15 modem -> /dev/block/mmcblk0p1
lrwxrwxrwx 1 root root 21 Mar 14 08:15 modemst1 -> /dev/block/mmcblk0p13
lrwxrwxrwx 1 root root 21 Mar 14 08:15 modemst2 -> /dev/block/mmcblk0p14
lrwxrwxrwx 1 root root 21 Mar 14 08:15 mota -> /dev/block/mmcblk0p34
lrwxrwxrwx 1 root root 21 Mar 14 08:15 msadp -> /dev/block/mmcblk0p48
lrwxrwxrwx 1 root root 21 Mar 14 08:15 oem -> /dev/block/mmcblk0p31
lrwxrwxrwx 1 root root 21 Mar 14 08:15 params -> /dev/block/mmcblk0p32
lrwxrwxrwx 1 root root 21 Mar 14 08:15 persist -> /dev/block/mmcblk0p27
lrwxrwxrwx 1 root root 21 Mar 14 08:15 recovery -> /dev/block/mmcblk0p23
lrwxrwxrwx 1 root root 21 Mar 14 08:15 recoverybp -> /dev/block/mmcblk0p24
lrwxrwxrwx 1 root root 20 Mar 14 08:15 rpm -> /dev/block/mmcblk0p6
lrwxrwxrwx 1 root root 20 Mar 14 08:15 rpmbak -> /dev/block/mmcblk0p7
lrwxrwxrwx 1 root root 20 Mar 14 08:15 sbl1 -> /dev/block/mmcblk0p4
lrwxrwxrwx 1 root root 20 Mar 14 08:15 sbl1bak -> /dev/block/mmcblk0p5
lrwxrwxrwx 1 root root 21 Mar 14 08:15 sec -> /dev/block/mmcblk0p18
lrwxrwxrwx 1 root root 21 Mar 14 08:15 splash -> /dev/block/mmcblk0p19
lrwxrwxrwx 1 root root 20 Mar 14 08:15 ssd -> /dev/block/mmcblk0p3
lrwxrwxrwx 1 root root 21 Mar 14 08:15 syscfg -> /dev/block/mmcblk0p37
lrwxrwxrwx 1 root root 21 Mar 14 08:15 system -> /dev/block/mmcblk0p54
lrwxrwxrwx 1 root root 20 Mar 14 08:15 tz -> /dev/block/mmcblk0p8
lrwxrwxrwx 1 root root 20 Mar 14 08:15 tzbak -> /dev/block/mmcblk0p9
lrwxrwxrwx 1 root root 21 Mar 14 08:15 userdata -> /dev/block/mmcblk0p55

you can dump with `dd` command in `adb shell`

adb shell

dd if=/dev/block/bootdevice/by-name/system of=/sdcard/system.img

dd if=/dev/block/bootdevice/by-name/boot of=/sdcard/boot.img

exit

and copy with `adb pull` in command line

adb pull /sdcard/system.img

adb pull /sdcard/boot.img