Okay can u try this, boot the poland rom rooted, and download the newest twrp image for our phone, dont use the twrp app,https://eu.dl.twrp.me/c70n/twrp-3.1.1-0-c70n.img.html download it from here to your pc, adb push it to your phone from the pc, and on the phone rename it "twrp.img" or "twrp"...