[LG V20 Guides, News, & Discussion] Wayne Nathaniel:
So no one else has been talking that much about this hidden menu but many users of the LG V20 is most likely familiar with this Menu since it's used to Check the ARB version if you wanted to downgrade. But it's not just for the ARB version checking, but also has hidden stuffs which i may discuss here.

If i ever made a mistake you are free to reply there, any suggestions and corrections are welcomed here.

So you can access the SVC Menu in LG V20 by putting the number *#546368#*NNN# (Replace the NNN with your correct number from your serial number). You can always check what model you are using from Settings>About Phone>Hardware Info. Find the 3 Digit number and put that on the NNN Part, Mine says F800L So i will dial *#546368#*800# but on other variants this would differ. Since there are multiple variants here. i can list the dial codes for the specific variant

F800 (L/S/K) : *#546368#*800#

US996 : *#546368#*996#

LS997 : *#546368#*997#

H910 : *#546368#*910#

H915 : *#546368#*915#

H918 : *#546368#*918#

VS995: *#546368#*995#

H990N/H990DS/H990T : *#546368#*990#

I am not sure if it will work on all of the variants but better try it anyway, i only have the F800L Variant so yeah i am not sure if this works on other variants but i heard that it works on US996.

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So now let's deep dive

So when you dial the code you'll see the HiddenMenu you'll find 3 options which is Device test, ELT Test and SVC Menu

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The first 2 are for the tests and the last one is the real SVC Menu itself.

Now starting with Device Test So you see SAAT, Download and Flash Lock.

SAAT

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SAAT is basically just testing your Phone's components. So it is more of a Device test to see which component is working on your phone and which one is defective. This is useful if you are getting a Used LG V20 to see if it is fully functional.

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Download

Honestly i tried this but There is no Actual explanation how this works but it looks like this

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I have no idea how this works but you can reply it on the replies section If you know this page.

Flash Lock

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This page also has no actual explanation here but if you know this screen then you can reply it down,

Now to ELT Test

So When you select ELT Test you have been greeted by a screen with 2 options if Automatic or Manual Mode.

Automatic obviously means automatic tests but if you don't want to test all then you select manual so you can have options

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Just like SAAT This also tests your device's components, i have no idea why it is necessary to have 2 Device tests here but unlike SAAT, ELT Test is less complex

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Backlight test

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Now to the SVC Menu itself

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So the SVC Menu has a lot of options

Version info let's you check the ARB version of your phone, Usually in Red Text but don't worry it's normal for it to be red as long it says ARB 0 you still can downgrade, if it says ARB 1 then you cannot downgrade But in Android 8 and newer it will say APPSBL(LK) : 0, SBL1 :0, TZ : 0, RPM : 0. If it says APPSBL(LK) : 0, SBL1 :0, TZ : 0, RPM : 0 then you can downgrade because that is equivalent to ARB0 but if it says APPSBL(LK) : 1, SBL1 :1, TZ : 1 RPM : 1 then that's ARB 1 So don't downgrade if you see APPSBL(LK) : 1, SBL1 :1, TZ : 1, RPM : 1

RF Cal info

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Obviously doesn't have a explanation, if you know this option please reply it on the replies section.

Log Service

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The Log Service let's you enable logging on your phone. Mine says Disabled because i have logging disabled on my phone but you can enable the logging up to 100 Files.

Logging can be used for troubleshooting if you have problems

In the most bottom part there is something Developer only and it looks like this

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This can be used by devs so this is for developers only. Usually used by App devs I guess

LDB

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LDB is used for tracking i guess but i am not sure if this is the correct information since there is no actual explanation for this.

LG RCT

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The LG RCT is LG's Built-in Root checker tool on LG phones. Usually came with Enabled, If you select Display Result then you; will get the Popup with a Code. Mine says Official since i did not rooted my phone

This also has an article which is here if you wanted to learn more about RCT

Port Check

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Port Check is DiagPort This can also be used for IMEI Repairs so keep this option enabled, Don't worry it won't cause harm or anything this is usually enabled by default.

Factory Reset (R&D Only)

Basically resets your device

CRCWIZARD Test

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CRC Can be used to get The NT Code of your Device. I am not sure if this was right but if you know more about CRC Wizard please reply it on the replies section.

Battery test

The Battery test can also be used as a Health checker also but in my case for my phone my Battery health isn't detected here, Maybe on other LG Phones but not the LG V20 But on the LG V60 there is possibly a Charge Cycle counter there but i am not sure about this.

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MCAfee Status

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Since LG phones Have MCAfee Security Pre-installed, you also can check the MCAfee status in the SVC Menu too, Mine says Disabled because i haven't opened it yet. MCAfee is A Anti-virus app on LG Phones

Since MCAfee is pre-installed on LG Phones you cannot uninstall or disable it unless if you have Root or Use ADB

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IME Setting

I have nothing much to explain about the IME Setting but it may be possibly missing on Non Korean variants. Please tell me if you have this option in your LG V20

VoWiFi

This option just let's you toggle the Wifi Calling Toggle. Mine is on off for whatever reason.

So yeah i now explored the most parts of the SVC Menu. But please remember NOT TO MESS AROUND WITH THE SVC MENU Since there are some parts that can break functionality, even though you now know what is it for but the SVC Menu is meant for OEMs I guess but However sometimes the SVC menu can be used for troubleshooting.