Black Detail Crushing LG FW 04.10.55 and ability to revert to FW 04.10.15
I know that this has been discussed here before but I wanted to put everything into one thread for anyone having this issue as it totally ruined my C877 TV. My son thought he was doing me a favor and "upgraded" to the new FW and it destroyed the black level details and ruined the TV! It's one thing to read about it in these forum and another thing to experience it first hand.
Here's why it's happening after you upgrade to FW 04.10.55 and how its not a figment of your imagination
Here is the 4.10.15 for C8PUA USA:
The MD5 hash is: fe5aaaa56eaaa3f779eb46c88f9ecbd9
Here's the App "SURE" remote control software from Google Playstore to revert back the FW.
Or from Apple App iOS
Put 4.10.15 onto a USB Flashdrive under a root directory of LG_DTV and insert into TV's USB port
Connect the phone to tv using the same network, then click "find LG tv"
Click on the software/firmware tab when set up and tv found is done via SURE software.
Select update software via USB Flashdrive using 4.10.15 FW
Click Update, FW will update and then it will turn off tv and once restarted you'll have FW 04.10.15 and your tv back to normal!
Here's a video to walk you thru it with the UK version of 4.10.20 but the steps are the same for US version 4.10.15 - the only issue is the audio quality is not that good but has decent screen shots.
Hopefully this is helpful to others and more easily discoverable via search engines until 05.x0.00 is official released - and thanks to members Tool Belt, jk82, jacko5, MrStruders, Macmane for their past contributions on this matter!