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
Bannerbomb3 AIO (use a VPN service if you cannot download the file) : http://u.pc.cd/tWCitalK
Bruteforce Movable : https://bit.ly/3BUqY3c
Bannerbomb3 Tool: https://3ds.nhnarwhal.com/3dstools/bannerbomb3.php
Fredtool : https://3ds.nhnarwhal.com/3dstools/fredtool.php
Alternative Rosalina menu : https://youtu.be/FKoO8Fhd-vQ
Soundhax (for 1.0.0 – 11.3.0 ) : https://youtu.be/xAZHecPWgMA
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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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DONATION
If you want to make a donation, click the link below
https://link.sthetix.info/donate
Thank you
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HOW TO CONTACT ME
Discord server : https://link.sthetix.info/discord
Discord : sthetix#7311
Twitter : https://twitter.com/sthetixofficial
Instagram : https://instagram.com/sthetixofficial
Facebook : https://www.facebook.com/sthetixofficial
www : https://www.sthetix.info
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CREDIT
Zoogie
Team Luma