Original source of OOS 9.0 MSM tool: https://forum.xda-developers.com/t/tool-t-mobile-oneplus-6t-msmdownloadtool-firmware-9-0-13-8-9.3868916/

Original source of conversion tool: https://forum.xda-developers.com/t/t-mobile-6t-to-international-conversion-without-unlocked-bootloader-sim-unlock.3888307/