Those who use TCL's latest triple-camera smartphone, the PLEX, may be pleasantly surprised by a new OTA update that confers Android 10 and the January 1, 2020 security patch on these devices. This download is 2.7GB in size, and that is because of all the other features found in the new OS, which include a Modern Combat title and numerous UI tweaks.
https://www.notebookcheck.net/TCL-Plex-owners-get-Android-10-and-more-from-their-latest-software-update.451749.0.html
his article is from January, but we are in April and the Android 10 is not available for my TCL Plex yet. I've checked with other TCL Plex owner and she is in the same situation. Still running Android 9 with December 2019 security package