Map the Power Boost key (top-right corner, scancode 0x64) to KEY_PROG1.
Map the Touchpad Toggle key (Fn+F8, scancode 0x76) to KEY_F21.
Verified working via evtest:
Event: type 4 (EV_MSC), code 4 (MSC_SCAN), value 64
Event: type 1 (EV_KEY), code 148 (KEY_PROG1), value 1
Event: type 4 (EV_MSC), code 4 (MSC_SCAN), value 76
Event: type 1 (EV_KEY), code 206 (KEY_F21), value 1
DMI: svnInfinix:*pnY3Max:*
AT keyboard scancodes: 0x64, 0x76 (set 2)
KEYBOARD_KEY_281=unknown # Brightness Down, also emitted by acpi-video, ignore
KEYBOARD_KEY_282=unknown # Brightness Up, also emitted by acpi-video, ignore
+###########################################################
+# Infinix
+###########################################################
+
+# Infinix Y3 Max YL-613
+evdev:atkbd:dmi:*:svnInfinix:*pnY3Max:*
+ KEYBOARD_KEY_64=prog1 # Power Boost key (top-right corner)
+ KEYBOARD_KEY_76=f21 # Fn+F8 Touchpad toggle, sends Ctrl+Meta+f21
+
###########################################################
# IBM
###########################################################