The great @kaihengfeng in the bug 1688625 told me to do this, and with this touchpad has worked partially:
sudo sh -c 'echo -n "elantech" > /sys/bus/serio/devices/serio2/protocol

Now if it works, but it works simply, without appearing as a touchpad in the system and without working with 2 fingers (scroll not work) or with 3, now it moves but only with a finger and these are its properties:

$ xinput --list-props 12

Device 'PS/2 Cypress Trackpad':
	Device Enabled (140):	1
	Coordinate Transformation Matrix (142):	1.000000, 0.000000, 0.000000, 0.000000, 1.000000, 0.000000, 0.000000, 0.000000, 1.000000
	libinput Accel Speed (545):	0.000000
	libinput Accel Speed Default (546):	0.000000
	libinput Accel Profiles Available (547):	1, 1
	libinput Accel Profile Enabled (548):	1, 0
	libinput Accel Profile Enabled Default (549):	1, 0
	libinput Natural Scrolling Enabled (550):	0
	libinput Natural Scrolling Enabled Default (551):	0
	libinput Send Events Modes Available (262):	1, 0
	libinput Send Events Mode Enabled (263):	0, 0
	libinput Send Events Mode Enabled Default (264):	0, 0
	libinput Left Handed Enabled (552):	0
	libinput Left Handed Enabled Default (553):	0
	libinput Scroll Methods Available (554):	0, 0, 1
	libinput Scroll Method Enabled (555):	0, 0, 1
	libinput Scroll Method Enabled Default (556):	0, 0, 1
	libinput Button Scrolling Button (557):	2
	libinput Button Scrolling Button Default (558):	2
	libinput Middle Emulation Enabled (559):	0
	libinput Middle Emulation Enabled Default (560):	0
	Device Node (265):	"/dev/input/event11"
	Device Product ID (266):	2, 1
	libinput Drag Lock Buttons (561):	<no items>
	libinput Horizontal Scroll Enabled (562):	1
	Synaptics Off (287):	0




Before this the touchpad did not move, and it returned these properties:


$ xinput --list-props 12

Device 'CyPS/2 Cypress Trackpad':
	Device Enabled (140):	0
	Coordinate Transformation Matrix (142):	1.000000, 0.000000, 0.000000, 0.000000, 1.000000, 0.000000, 0.000000, 0.000000, 1.000000
	Device Accel Profile (270):	1
	Device Accel Constant Deceleration (271):	2.500000
	Device Accel Adaptive Deceleration (272):	1.000000
	Device Accel Velocity Scaling (273):	12.500000
	Synaptics Edges (274):	60, 1440, 37, 663
	Synaptics Finger (275):	25, 30, 0
	Synaptics Tap Time (276):	180
	Synaptics Tap Move (277):	72
	Synaptics Tap Durations (278):	180, 180, 100
	Synaptics ClickPad (279):	0
	Synaptics Middle Button Timeout (280):	75
	Synaptics Two-Finger Pressure (281):	282
	Synaptics Two-Finger Width (282):	112
	Synaptics Scrolling Distance (283):	-33, -33
	Synaptics Edge Scrolling (284):	0, 0, 0
	Synaptics Two-Finger Scrolling (285):	1, 1
	Synaptics Move Speed (286):	1.000000, 1.750000, 0.120846, 0.000000
	Synaptics Off (287):	2
	Synaptics Locked Drags (288):	0
	Synaptics Locked Drags Timeout (289):	5000
	Synaptics Tap Action (290):	0, 0, 0, 0, 0, 0, 0
	Synaptics Click Action (291):	1, 1, 0
	Synaptics Circular Scrolling (292):	0
	Synaptics Circular Scrolling Distance (293):	0.100000
	Synaptics Circular Scrolling Trigger (294):	0
	Synaptics Circular Pad (295):	0
	Synaptics Palm Detection (296):	0
	Synaptics Palm Dimensions (297):	160, 200
	Synaptics Coasting Speed (298):	20.000000, 50.000000
	Synaptics Pressure Motion (299):	30, 160
	Synaptics Pressure Motion Factor (300):	1.000000, 1.000000
	Synaptics Resolution Detect (301):	1
	Synaptics Grab Event Device (302):	0
	Synaptics Gestures (303):	1
	Synaptics Capabilities (304):	1, 1, 1, 1, 1, 1, 1
	Synaptics Pad Resolution (305):	11, 15
	Synaptics Area (306):	0, 0, 0, 0
	Synaptics Noise Cancellation (307):	8, 8
	Device Product ID (266):	2, 17
	Device Node (265):	"/dev/input/event5"