[Samsung Galaxy Watch 4] adfree:
<?xml version="1.0" encoding="UTF-8"?>
<FactoryTestLauncherFeature>
<Feature>
<!-- *************************************************************************************************
This FTL function File : default (Communication Mode)
Example
<feature id="function name" value="true or false" />
************************************************************************************************** -->
<feature id="EasyFactorytestMonitoring" value="true" />
<feature id="LiteMyFiles" value="true" />
<feature id="GadgetMode" value="true" />
</Feature>

<Function>
<Version>
<item name="RESET_CABLE_DETECT_COUNT" title="Reset Connector Detect Count" description="Reset Connector Detect Count" />
<item keystring="*#33725327#" title="EFS Clear" description="Clear EFS partition" />
<item keystring="*#27663368378#" title="NV Rebuild" description="NV rebuild" />
<item keystring="*#6648#" title="NV Viewer" description="NV Viewer" />
<item keystring="*#7547#" title="Test History" description="Test history NV list" />
<item keystring="*#5238973#" title="LcdTypeInfo" description="Display LCD type" />
<item keystring="*#2663#" title="F/W Ver" description="Display TSP, TouchKey, SensorHub, Wifi, Bluetooth FW version, Update menu available" />
<item keystring="*#12580*369#" title="Detail Ver" description="Display AP,CP,RF Cal, HW Rev" />
<item keystring="*#0283#" title="Loopback Test" description="Check RCV, SPK, Earphone Loopback" />
<item keystring="*#0842#" title="Vibration, SVD_LED" description="Vibration test, Vibration value adjustable, SVC_LEC test, led rgb value adjustable" />
<item keystring="*#3746#" title="eSIM Profile" description="eSIM Profile" />
<item action="com.sec.android.app.servicemodeapp" title="Dumpstate" description="Enter Dumpstate" activity="com.sec.android.app.servicemodeapp.SysDump" />
</Version>

<Tester>
<item action="com.sec.factory.camera" title="Camera Test" description="Front / Rear camera test" activity="com.sec.android.app.camera.CameraTestActivity" extra="testtype,FUNC/arg1,secret" />
</Tester>

<Sensor>
<item keystring="*#4378873#" title="Gesture Sensor" description="Gesture Sonsor test, Display A,B,C,D Value, check Direction." />
<item keystring="*#0588#" title="Proxi Test" description="Proximity sensor test" />
<item keystring="*#1004#" title="Sound Source Test" description="Test stereo, left ,right speaker by six music" />
<item keystring="*#7769#" title="Proximity Offset" description="Display proximity sensor value, Set Low, High Threshold" />
<item keystring="*#435517#" title="Grip Sensor" description="Select Grip Sensor, Calibration available" />
<item keystring="*#1106#" title="Grip On/Off" description="Grip Sensor On,Off" />
</Sensor>

<TSP-TSK>
<item keystring="*#7736#" title="S-Pen Detection Test" description="S-Pen detection test. Display count" />
<item keystring="*#77368378#" title="S-Pen Simple Test" description="S-Pen test on grid panel, Show values(X,Y,Pressure)" />
<item keystring="*#77361379#" title="S-Pen 3 Menu Test" description="S-Pen test, Accuracy/Pressure, Linearity, Hover Accuracy menu available" />
<item keystring="*#3736#" title="S-Pen 2 Menu Test" description="S-Pen test, AccuracyPont,Pressure, Line linearity menu available" />
<item keystring="*#8778378#" title="TSP Test" description="output TSP, Hover data to SD Card, Hover Accuracy Test" />
<item keystring="*#877#" title="Result of TSP" description="Display Result of TSP" />
<item keystring="*#46837#" title="Glove Touch Test" description="TSP High sensitivity mod test(TSP test while wearing glove)" />
<item keystring="*#8778378#" title="TSP Test mode" description="output TSP, Hover data to SD Card, Hover Accuracy Test" />
<item keystring="*#80#" title="Touch Noise" description="Touch noise test" />
<item keystring="*#251#" title="TSK ON" description="Light on software key" />
<item keystring="*#250#" title="TSK OFF" description="Light off software key" />
</TSP-TSK>

<ETC>
<item keystring="*#0228#" title="Battery Status" description="Display battery status(Current,Avaerage Value of Voltage, Temperature, Level, Level Block), Quickstart function available(Fuelgauge reset)" />
<item keystring="*#350#" title="Reboot" description="Perform Reboot" />
<item keystring="*#4327#" title="HDCP Check" description="HDCP check" />
<item keystring="*#22235#" title="Acc Cal" description="Display accelerometer value(X,Y,Z), Calibration function available" />
<item keystring="*#0842#" title="Vibration, SVD_LED" description="Vibration test, Vibration value adjustable, SVC_LEC test, led rgb value adjustable" />
<item keystring="*#0673#" title="Melody" description="Speaker, Receiver, Headset, Receiver_Headset, OFF menu available, Beeping" />
<item keystring="*#2664#" title="Pointer Locaion" description="Check touch point location" />
<item keystring="*#9998*3288#" title="Counter Print" description="Display TACounter, EPenCounter, EarjackCounter, QwertyCounter, FlashPopupCounter, TMBCounter value by Toast" />
<item keystring="*#767*2878#" title="Qwerty Slide Reset" description="reset Qwerty Slide counter value" />
<item keystring="*#0283#" title="Loopback Test" description="Check RCV, SPK, Earphone Loopback" />
<item keystring="*#7328735824#" title="Lot ID" description="Display Lot ID" />
<item keystring="*#22228378#" title="Cabc/Outside Test" description="Cabc On,Off Available, Outside Mode On,Off Available" />
<item keystring="*#1105#" title="Fail History" description="Display Fail Histroy" />
<item keystring="*#726387#" title="PCM Dump" description="PCM Dump, Record Test" />
<item keystring="*#26732875#" title="Core CTRL" description="Core(CPU) Control" />
<item keystring="*#272447#" title="AP Chip Test" description="Display AP Chip Test, PVS, IDDQ value" />
<item keystring="*#6364366633#" title="Mdnie On/Off" description="Mdnie On,Off" />
<item keystring="*#0775#" title="RCV/SPK Test" description="RCV,SPK test by 200,500,1000hz" />
<item keystring="*#7594#" title="Shutdown Setting" description="Shutdown, 1 Key Hard Reset setting available" />
<item keystring="*#272886#" title="Auto Answer Device" description="Auto Answer Without Device On,Off setting available" />
<item keystring="*#2288379#" title="Fuel Gauge Register" description="Setting Fuel Gauge" />
<item name="RESET_ALL_NV_TO_N" title="Reset All NV to N" description="To release factory binary" />
<item action="com.samsung.android.GEDFactoryTestLauncher" title="Wireless Dump" description="Get Dumpstate by WIFI" activity="com.samsung.android.GEDFactoryTestLauncher.addons.WirelessDump.WirelessDump" />
</ETC>
</Function>
<SecretMode>
<item secretcode="12453" name="SUPER_MODE" enable="true"/>
<item secretcode="12345" name="TESTER_MODE" enable="true"/>
<item secretcode="13524" name="USER_MODE" enable="true"/>
<item secretcode="54321" name="MYFILES_MODE" enable="false"/>
<item secretcode="11111" name="TEST" enable="false"/>
</SecretMode>
</FactoryTestLauncherFeature>

Found this in Combination Firmware AVI4...

Not tested yet...

Stupid test...

I mixed FAC Kernel AVI4 with GVK6... runs... but battery shows 0...

So IMHO really risky... as Charging not work...

Recovery Kernel shows correct Battery...

Best Regards

Edit 1.

Maybe Filemanager inside Combination Firmware...

com.sec.android.app.myfiles

I am not sure as I saw only Video... with yellow Icon

FTL MyFiles