Please see the following list for which folder to get the autoboot file(s) from.

Ace3DS+ folder:
- Ace3DS+
- Ace3DS X
- R4 i.L.S
- r4isdhc.com.cn cards
- r4isdhc.hk 2020+ (Year in star shape)
- r4isdhc.hk 2021
- R4infinity 2
- R4i-XDS 2014 white version
- R4xMP

Blue R4i Revolution folder:
- Blue R4i Revolution v1.4.1
- R4i Gold Upgrade Revolution v1.4.1
- R4i 3D (www.r4i-gold.hk)
- GoldR4 3DS (v4.301 kernel)
- R4i SDHC Upgrade Revolution (www.r4i-sdhc.com.tw)

DSTT folder:
- DSTT
- DSTTi
- DSTTi Gold
- DSTT-Advance
- R4Top Revolution
- r4i-gold.com R4 3DS Gold RTS
- PK3DS
- R4i-SDHC v1.41 + v1.42

R4DS Pro folder:
- r4dspro.com cards

R4 Ultra folder:
- R4 Ultra
- r4ids.cn cards
- R4iTT 3DS
- R4i3D 2012+
- r4isdhc.com NEW
- r4isdhc.com 2013
- r4isdhc.hk -2019
- r4igold.cc 3DS translucent
- r4i-gold.me 2013+

R4i-SDHC folder:
- R4i-SDHC
- r4isdhc.com cards 2014+
- r4ixl-sdhc.com cards
- R4i SDHC Upgrade Revolution
- R4DSiXL3D, R4i Advance
- R4-IIIi, R4 SDHC Revolution
- R4(i) Pocket
- R4i Gold (v1.4.1) (3DS)
- R4xDS

R4i Upgrade Revolution folder:
- R4i Upgrade Revolution
- R4i3D Original