[Android Head-Units] Pascal06:
So,

I tied to follow these steps to see if I can enable "USB debugging",

as I can I do ADB though Wifi.

I looked into the build.prop:

rk3368:/system # cat build.prop

# begin common build properties
# autogenerated by build/make/tools/buildinfo_common.sh
ro.system.build.date=Fri Apr 22 14:21:44 CST 2022
ro.system.build.date.utc=1650608504
ro.system.build.fingerprint=rockchip/rk3368/rk3368:11/RP1A.201105.002/autobuild2204221421:userdebug/release-keys
ro.system.build.id=RP1A.201105.002
ro.system.build.tags=release-keys
ro.system.build.type=userdebug
ro.system.build.version.incremental=eng.autobu.20220422.142152
ro.system.build.version.release=11
ro.system.build.version.sdk=29
ro.product.system.brand=rockchip
ro.product.system.device=rk3368
ro.product.system.manufacturer=rockchip
ro.product.system.model=PX5
ro.product.system.name=rk3368_Android10
# end common build properties
# begin build properties
# autogenerated by buildinfo.sh
ro.build.id=RP1A.201105.002
ro.build.display.id=rk3368-userdebug 11 RP1A.201105.002 eng.autobu.20220422.142152 release-keys
ro.build.version.incremental=eng.autobu.20220422.142152
ro.build.version.sdk=29
ro.build.version.preview_sdk=0
ro.build.version.preview_sdk_fingerprint=REL
ro.build.version.codename=REL
ro.build.version.all_codenames=REL
ro.build.version.release=11
ro.build.version.security_patch=2020-11-05
ro.build.version.base_os=
ro.build.version.min_supported_target_sdk=23
ro.build.date=Fri Apr 22 14:21:44 CST 2022
ro.build.date.utc=1650608504
ro.build.type=userdebug
ro.build.user=autobuild
ro.build.host=dl380
ro.build.tags=release-keys
ro.build.flavor=rk3368_Android10-userdebug
# ro.product.cpu.abi and ro.product.cpu.abi2 are obsolete,
# use ro.product.cpu.abilist instead.
ro.product.cpu.abi=arm64-v8a
ro.product.cpu.abilist=arm64-v8a,armeabi-v7a,armeabi
ro.product.cpu.abilist32=armeabi-v7a,armeabi
ro.product.cpu.abilist64=arm64-v8a
ro.product.locale=en-US
ro.wifi.channels=
# ro.build.product is obsolete; use ro.product.device
ro.build.product=rk3368_Android10
# Do not try to parse description or thumbprint
ro.build.description=rk3368-userdebug 11 RP1A.201105.002 eng.autobu.20220422.142152 release-keys
# end build properties

#
# ADDITIONAL_BUILD_PROPERTIES
#
ro.bionic.ld.warning=1
ro.treble.enabled=true
persist.debug.dalvik.vm.core_platform_api_policy=just-warn
dalvik.vm.lockprof.threshold=500
net.bt.name=Android
car.hw_name=px5_10
car.hw_bt_uart=/dev/ttyS1
car.hw_mcu_uart=/dev/ttyS3
car.hw_dsp_i2c_num=5
car.part_by_name_path=/dev/block/by-name
car.block_path.config=/dev/block/by-name/config
car.block_path.logo=/dev/block/by-name/logo
car.block_path.misc=/dev/block/by-name/misc
car.boot_msg_offset=0
car.boot_msg_size=32768
car.ota_prefix=ZQ_PX5D_
car.brightness_path=/sys/devices/platform/backlight/backlight/backlight/brightness
car.rk_new_video_in=true
car.video_apk_version=2
car.cpu_info=8x\bARM\bCortext-A53\b@\b1.5\bGHz
ro.car.has_auth_ic=1
ro.product.DAB.serial=/dev/ttyV1
ro.config.wallpaper=/system/ziqi/wallpaper.jpg
ro.sf.lcd_density=240
ro.lockscreen.disable.default=true
ro.build.version.min_supported_target_sdk=19
qemu.hw.mainkeys=1
car.info_node_cpu_temp=/sys/devices/virtual/thermal/thermal_zone0/temp
car.info_node_gpu_temp=/sys/devices/virtual/thermal/thermal_zone1/temp
car.info_node_cpu_max_freq=/sys/devices/system/cpu/cpu0/cpufreq/scaling_max_freq
car.info_node_cpu_cur_freq=/sys/devices/system/cpu/cpu0/cpufreq/scaling_cur_freq
car.support_fake_mem=1
car.support_fake_flash=1
car.bt_support_list=4,6,7,8,9,11,12,14
car.phonelink_support_list=zlink,jlink

No chance, there aren't the

persist.service.adb.enable=1
persist.service.debuggable=1
persist.sys.usb.config=mtp,adb

So it's turning round and round...