Razer Blackwidow Ultimate 2016 detected as Usb drive(CRP1 ENABLD) and not responding

Hi guys!
I am using this keyboard since july,2018. But on 10th january 2019 when i started my pc, My keyboard did'nt work. When desktop appeared drive named CRP1 ENABLD automatically opened which contains the file 'firmware.bin'. I tried connecting it on different usb ports but that did'nt help. I also tried connecting it on different pc. it also did'nt help me. I disconnected keyboard and put that on its box. After almost 5 hours i take it out of Box and connected it to pc through front usb ports. Surprisingly it was detected as a Blackwidow Ultimate 2016 keyboard and worked properly. But when i disconnected it and again connected it gives the same drive and did'nt respond. I tried almost every solution available on net. i.e. installing firmware updater, Uninstalling synapse and installing it again. But these solutions did'nt help me at all. Kindly help me guys!
Can you guys please help me regarding this. Why my keyboard is being detected as USB flash drive?, and when i connected it back after some long time it is detected without any issue, but after reconnecting it again on pc, it is detected as usb drive? Any solution How can I come out of USB drive mode of this keyboard? Please help me