關於Sharp S2降版

https://forum.xda-developers.com/android/general/sharp-aquos-s2-ss2-sat-thread-t3761071

FOR SAT AND SS2- OFFICIAL BASED ROMS (FOR OST) (for unbricking and downgrading. incl 9008 mode) :
Quote:
@ SS2 135E_WW ROM flashing "from box" and unbricking via OST
@ SAT 127E_CN ROM flashing "from box" and unbricking via OST

裡面似乎有降版的方法。請問有人試過嗎？可行嗎？
謝謝！