As you see, cm12.1 version : cm-12.1-20160704-UNOFFICIAL-hammerhead-nocheck.zip twrp version: TWRP_multirom_hammerhead_20150630.img(2.8.7) sailfish: SFOS3.2120-CM121-20200113.zip I have flashed cm-12.1-20160704-UNOFFICIAL-hammerhead-nocheck.zip about 10 times,no one sucess,bootloop