You will need:
The NCA of the original version of FLOG, look for f1d1780e16fc0d555808cfd59687b188.nca, you can get it from the update directory of all gamecarts released before 2018, and some after.
A copy of Retro City Rampage DX, doesn't matter which version (although the cart version has FLOG on it ).
The standard RCM/homebrew gubbins.

How to do it:
1. Extract the ExeFS from the FLOG NCA to a directory using hactool (--exefsdir flag).
2. Copy the "main" file to sd:/atmosphere/titles/0100F17004156000/exefs, creating the 0100F17004156000 and exefs folders along the way (you should already have the first two).
3. Boot into custom firmware using hekate.
4. Launch Retro City Rampage DX.
5. ?????
6. Profit!

Video of it running on 5.1.0:

 

[XorTroll]

Ooh very interesting, testing if it works with my BOTW cart

 

[XorTroll]

It doesn't load, it keeps loading but after 5 minutes nothing shows up

 

[Naked_Snake]

Anyone got this working with any other game

 

[SimonMKWii]

Anyone got this working with any other game

Yes, it works with any game now! Simply patch the npdm with your target game's title id.

 

[Sonic Angel Knight]

Can a mod update this thread title to include "Requires CFW/HOMEBREW/HACK" Whatever so people know is not official firmware possible?

 

[SimonMKWii]

Can a mod update this thread title to include "Requires CFW/HOMEBREW/HACK" Whatever so people know is not official firmware possible?

It's basically self-explanatory...

 

[Joshtech]

Tried this the other day.

You will need to edit FLOGs Title ID in main.npdm to the Title ID of the application you wish to replace
Also copying sdk, subsdk0, subsdk1 and subsdk2 to the exefs folder (or you will get blackscreen)

I used the SnipperClips Demo XD

 

[Naked_Snake]

Yes, it works with any game now! Simply patch the npdm with your target game's title id.

How do we do that

 

[Joshtech]

Download a hex editor. I use HxD (https://mh-nexus.de/en/hxd/)

Open up main.npdm in HxD
Search for "00 C0 13 00 B0 8B 00 01" which is FLOGs TitleID (01008BB00013C000) in little endian (Found here: http://switchbrew.org/index.php?title=Title_list)

Spoiler

Replace FLOGs Title ID with the application's Title ID making sure it's also little endian (I'll use SnipperClippers Title ID (0100D87002EE0000) as an example "00 00 EE 02 70 D8 00 01") (Found here: http://switchbrew.org/index.php?title=Title_list/Games)

Spoiler

Save, and copy to your "atmosphere\titles\<titleID>\exefs" folder

 

[Naked_Snake]

Download a hex editor. I use HxD (https://mh-nexus.de/en/hxd/)

Open up main.npdm in HxD
Search for "00 C0 13 00 B0 8B 00 01" which is FLOGs TitleID (01008BB00013C000) in little endian (Found here: http://switchbrew.org/index.php?title=Title_list)

Spoiler

Replace FLOGs Title ID with the application's Title ID making sure it's also little endian (I'll use SnipperClippers Title ID (0100D87002EE0000) as an example "00 00 EE 02 70 D8 00 01") (Found here: http://switchbrew.org/index.php?title=Title_list/Games)

Spoiler

Save, and copy to your "atmosphere\titles\<titleID>\exefs" folder

i changed it to snakepass titleID but i just got an error telling me it has corrupted data and my switch wants to check it

 

[einfuchsdrache]

I tried putting it over the User's Page, but it crashes as soon as I clicked on it. I made sure the TID is edited in little endian and all but it crashes. Any Idea?

 

[alkar]

i changed it to snakepass titleID but i just got an error telling me it has corrupted data and my switch wants to check it

just have it check for corrupted data then it should work

--------------------- MERGED ---------------------------

I tried putting it over the User's Page, but it crashes as soon as I clicked on it. I made sure the TID is edited in little endian and all but it crashes. Any Idea?

make sure you copy all the files (sdk ones too) and not only main and main.npdm

 

[einfuchsdrache]

just have it check for corrupted data then it should work

--------------------- MERGED ---------------------------


make sure you copy all the files (sdk ones too) and not only main and main.npdm

I did that, it doesn't work.

 

[NO_ob]

I tried putting it over the User's Page, but it crashes as soon as I clicked on it. I made sure the TID is edited in little endian and all but it crashes. Any Idea?

how do i convert a title id to little endian idk what that is lel

 

[XorTroll]

The main.npdm has to be modified, because it contains the title id of it's original app, so you must put there the id of the app you're using to run flog over.

 

[einfuchsdrache]

how do i convert a title id to little endian idk what that is lel

you can literally google "convert to little endian"

 

[NO_ob]

you can literally google "convert to little endian"

only converter drops like 4 bytes

 

[einfuchsdrache]

only converter drops like 4 bytes

If you put in the titleID, it should convert it into little endian. TID's aren't that long so...

 

[Deleted User]

struggling to get hactool to work with me. Claims key's are incorrect, even though I followed the key dumping guide (https://gbatemp.net/threads/how-to-get-switch-keys-for-hactool-xci-decrypting.506978/#post-8042765) and I'm struggling still for some reason.

 

[Naked_Snake]

@SimonMKWii got this to work last night pal, i used Snipper clips demo also