If you cannot do the PicHaxx method to install the Luma3DS on fw 11.15, consider trying the Bannerbomb3 method
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LINKS
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TIMESTAMPS
00:00 Start
00:32 Disclaimer
00:41 Inspecting the console
01:18 Getting the Friend Code
01:50 Checking the ID0 Folder
03:48 Go here if you only have one ID0 folder
03:53 Getting the movable.sed
05:41 Getting the Bannerbomb3 archive
06:48 Generating the DSiWare backup file
07:53 Generating the Fredtool archive
09:01 Installing the Fredtool content
09:33 Downloading and Installing the AIO pack
09:54 Installing the Boot9Strap
11:20 Configuring the Japanese Flipnote Studio
12:47 Configuring the Luma3DS
13:09 Restoring the DS Connection Settings
14:36 Finalizing Setup
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MUSIC
https://elements.envato.com/for-education-N4N9NY2
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CONTACT & DONATION
https://linktr.ee/sthetixofficial
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CREDIT
Zoogie
Team Luma
source