@adfree my friend.Can you please give full infos about Firmware?
*#1234#
This is easiest way to find nearly all usefull Infos Firmware related. Type this Code... like you would call someone...
R870XXU1AUH1 in Google no hits...
Best Regards
Firmwares soon :
For eg. SM-R880/XSA/R880XXU1AUGE/R880OXM1AUGE/R880XXU1AUGE/R880XXU1AUGE - GW4 CLASSIC BLUETOOTH 42mm
SM-R890/XSA/R890XXU1AUGE/R890OXM1AUGE/R890XXU1AUGE/R890XXU1AUGE - GW4 CLASSIC BLUETOOTH 46mm