I cannot see which version of FW installed and cannot downgrade the FW. when I insert SD card with .bin inside, the camera's LED do nothing, it just solid green. There's no updating process. It shows 'The current firmware does not support downgrade. Use a different version of firmware to downgrade the target version.' Have tried and followed procedures i've read in this forum many times but there was no result. does anybody here know how to resolve this issue?