Legacy Coolsand RDA drivers may lack a modern Microsoft digital signature. You must temporarily disable this security check:
Your PC will reboot into a blue option menu. Navigate to: > Advanced options > Startup Settings . Click the Restart button. coolsand rda usb driver 64-bit windows 10
Power off your phone completely and remove the battery for a few seconds, then reinsert it. Legacy Coolsand RDA drivers may lack a modern