How can I flash back to DVR-A12XL?

Hi bros.
I flashed my DVR-A12XL 1.09 (original) to DVR-A12L 1.15 with TDB’s flasher.
Now I’m trying to flash back to the original firmware because It seems to have some problems with a modified firmware.
I looked at Koba’s firmware but there is a firmware for DVR-A12L, not DVR-A12XL.
Does somebody know how to flash it back to the original?

nobody knows that?
please help me out~

You need to hack the flasher of the original stock firmware in order to do that. I don’t think anyone has done that yet AFAIK.