It's simple. If you have any custom recovery installed (twrp or cwm) you are on the original mdk firmware. No other firmware will allow custom recovery. And safestrap really only should be used if you can't get a custom recovery installed. Flashing a radio (baseband only changes) will not alter your firmware kernel or bootloader.
T-Mobile 32GB - Rooted (TWRP 188.8.131.52)
Galaxy Note 10.1 32GB 2014 Edition
Galaxy S4 (VZW MDK) sold to pay for my Note 3
Droid Bionic - Traded for Note 3
Droid X - Now a WiFi phone.