JR6150 / R6050 Firmware Version 1.0.1.26 Time Stamp Release Date

> I want to know the timestamp for when the firmware was made available
> to the public.

   Why?

   If you believe the date+time info on the files in the archive, then
I'd say after about 2019-12-19:00:00 (local time, someplace).

$ unzip -l JR6150_R6050-V1.0.1.26_1.0.1.zip
Archive:  JR6150_R6050-V1.0.1.26_1.0.1.zip
  Length      Date    Time    Name
---------  ---------- -----   ----
 13136254  12-18-2019 23:44   JR6150_R6050-V1.0.1.26_1.0.1.img
      842  12-18-2019 23:53   JR6150_R6050-V1.0.1.26_1.0.1_Release_Notes.html
---------                     -------
 13137096                     2 files