So, that's a good reason to lock it again flashing 1.9. It should fix this issue.
Force edl mode using button combination.
Turn off your phone.
Press and
hold Volume Up and Volume Down button
Connect your phone to the computer with a type-c usb cable
Your Phone is now in fastboot mode (release the keys)
Open terminal (cmd) and type
fastboot -i 0x2b4c oem reboot-edl