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Hey I was wondering the same thing. But I figured it out, download the CSB3 vendor image from OP then download fw from https://mega.nz/#F!wFFQUYbI!GZvNOBSn1wVn8U9mQDzBiw!kIMEBKoZ
Then flash the zip and for the vendor image you have to go to where you stored it on twrp then press...