BMD Broadcast G2 - Flickering screen after firmware 7.5/7.7

Hi, I just upgraded my new blackmagic design broadcast g2 camera with camera firmware 7.7 (which only upgraded to 7.5). After a day, the flip-out screen starts flickering non-stop. After a while, it cannot be usable. The screen flickering is very disturbing. The viewer finder also has issues. The entire viewfinder has red color lines (similar to Peak display).

Is this is a defective flipout screen (only 30 days in use), or is this is firmware defect?

WHAT I HAVE DONE
1. factory reset - no use
2. downgrade - install camera update 7.4, 7.5, 7.6 and 7.7. it does not downgrade. (need help how to force downgrade - the screen issue only happened after i upgraded the firmware)
3. press PGM to reset - no use
4. power off/on - no use

any pointer would be helpful.
thanks

I took a video of the flickering issues and posted to youtube.

I speculated this may be a hardware issue and hope it's not related to the firmware update (sensor calibration).

You can find that out very easily: is the output of the SDI connections or the recording normal?
Then it's not the sensor.

Initially, I can record to an external SSD drive despite the flipout screen is flickering. I tested using an external TV monitor and also a viewfinder.

Once after the screen deteriorated, the screen is blank black, the camera is not usable - not responsible to any button, power cycle or factory reset.

I finally sent the camera to Blackmagic for repair.

If it's a hardware defect, it's just unfortunate for a 31-day use.