I just need a clarification. I Have Icsh92_wet_jb9 with MIUI 5 Stable with android 4.2.2 installed and not rooted. Can I install TWRP from your list from updater and then clean flash stable MIUI 7.3 or 7.5 in TWRP??
Use flasify (play store) to install TWRP and than flash ROM. My opinion is that the most secure option is over adb fastboot via PC here is link http://www.xda-developers.com/how-to-install-twrp/ and than install ROM from recovery