Samsung S6 Edge + G928f stuck on android is upgrading!!!!!

hello every 1 ....hoping every 1 is fine here...now my problem is that i tried to install a S7 edge custom room on my S6 edge + g928f...after few fail attempt when i try to go back to official s6 edge + firmware my mobile stuck on Android is upgrading... Starting Apps.. screen with 2 rotating gears after flashing with SMART SWITCH...let me clear here that stuck means it was not going further otherwise gears where continuously rotating....
now things which i already tried....i downgraded firmware to 5.1.1. with odin.....all process was ok...until its finish flashing and restart and again ended up on same place...
i even used 4 files repair firmware with pit file selecting re-partition but again ending was same....try to update with smart switch...after completing the installation and first reboot again ended on same screen...i rooted mobile....tried custom room but no luck....wipe cached and master reset but no joy...not even going in to safe mode.......what ever i will do it will stop on rotating gear screen or samsung logo .....in TWRP i can see all the installation folder and files in mobile...my mobile is not heating up no random reboot and no any other issue....download mode and recovery is working perfect.....i hope some senior member can guide me to solve this problem...thnx n regards