Thank you for your review post. I also recently bought Z60pro with 4g module. My issue is that after I have done all the installation well, everything is working fine including 4G LTE, parking mode. But I run into issue that when I choose the device mode to sleep in parking mode, I can't wake it up from 4G LTE remotely, and on the app, it shows "Failed to switch device mode: please try again later", but when I tried again, the device said offline, even 4G module light is on, and working. But the Z60pro woke up when I tested the car shaking and it records for collision movement. When I put z60 pro into time-lapse mode and normal recording in parking mode, I can remotely view the device. But I want sleep mode to be working because I don't want a 48 hrs limitation for time-lapse mode and normal recording mode. My 4G network test is normal, full signal strength, ddpai and z60pro latest version (global), but my Z60pro fails to wake up from sleep mode. I am thinking may be I can downgrade to previous firmware, but currently unable to find previous firmware. If you have any solution for that, really appreciated it.