Original source of OOS 9.5.5 MSM tool: https://forum.xda-developers.com/t/guide-t-mobile-one-plus-7-pro-msm-tool-revert-back-to-tmo-stock.3936528/

Original source of conversion tool: https://forum.xda-developers.com/t/guide-how-to-convert-tmobile-op7-to-international.3935947/