[Q] Safe to flash earlier baseband?

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http://forum.xda-developers.com – I'm currently running a stock rooted i337M S4, it's running the latest baseband I337MVLUAMG1, I tried using Triangle Away for reset the flash/binary counter, but it didn't work and gave me an error. I was thinking on using ODIN to unroot by flashing an earlier firmware with an earlier baseband to see if Triangle Away will work with that firmware (still Android 4.2.2), the earliest firmware for my phone is from May 4th/13 with I337MVLUAMDJ, would it be safe to flash an earlier firmware on my phone? (HowTos)