JEI JIG v3.0
J---JTAG  read/write
E---EMMC  read/write 
I---ISP   read/write  

1. chip-off(desoldering): SD read or boxes read (support emmc153,emmc169,emcp162,emcp186,emcp221,emcp529 all in 1)

2. non-chip-off(no desoldering): boxes/programmer isp or jtag connect to phone's mainboard

chip-off(desoldering)
non-chip-off(no desoldering)