Trackpad firmware update

[wasgurd]

Those of you who got their PBPs in late 2019 and early 2020, please do the following to determine which  firmware you have:
1) open a terminal window
2) place on finger on trackpad
3) type any letter

Report if the letter you typed showed up. If it did, good, its the newest firmware.

Well, apparently I've to update, there was no letter.

Now the touchpad passes the test, but when I stop move my finger on the touchpad the cursor continues move by itself for a short distance.
So I cannot point the cursor on a small objects. I use Debian Testing and Mate from the Unofficial Installer by @danielt.