Download links for different versions of iFallcon 55k2a which has
CHASSIS : MT5658.
I am currently on V544 and is quite stable and NTFS drives works fine.
Use it at your own risk.
Android Oreo
V546:
Shared with Dropbox
www.dropbox.com
V544:
drive.google.com
V535:
Shared with Dropbox
www.dropbox.com
R549:
Shared with Dropbox
www.dropbox.com
Here are some more versions from Australian TCL website.
https://support(dot)tclelectronics.com.au/software-version/
How to update:
1. Turn off the TV (TV mains plug power off)
2. Copy the firmware to the root directory and insert the FAT32 formatted USB stick.
3. Press and hold the power button on the TV.
4. Turn on mains power to the TV (while keeping the power button pressed)
5. TV should detect USB drive, after about ten seconds, you will see the upgrade notification on the TV.
As soon as you see this, release the power button. If it doesnt detect USB pendrive, try it with a different one (less than 32GB).
The TV will now update and may take upto 20-25mins. Do not disconnect
or press any buttons, until you see the Google welcome page. The update is now done.