This flashable zip will update or downgrade your Firmware and Modem Files of your OnePlus 3 or 3T. It will also flash the stock logo.bin. If you use a custom Bootlogo, you can replace the logo.bin in the "firmware-update" Folder.
Normally I test all the .zip Files before I upload them, so everything should work fine.
*If you want more mirrors, just ask for it.