@ricardo-dicky
I did a clean install of recalbox
Use the putty program to stop recalbox

IP: ***
Login: root
Password: recalboxroot

Stop or start Emulationstation
/etc/init.d/S31emulationstation stop
then enter
mount -o remount, rw /

then run WinSCP

IP: ***
Login: root
Password: recalboxroot

get on the route
/recalbox/share_init/system/.emulationstation
and extract to the PC es_systems.cfg
create the systems you want to add
and copy it on this route
/recalbox/share/system/.emulationstation

last since putty starts recalbox

Start start Emulationstation
/etc/init.d/S31emulationstation start

Possibly this badly written since I use the translator :(

@paradadf said in Thanks again :)

@paradadf thank you very much for the time spent :) I could solve it, just reinstall recalbox again and start with the process from scratch. now if I load the games in the separate system "SNES MSU-1"

@paradadf https://forum.recalbox.com/topic/13244/recalbox-next-add-custom-systems

@paradadf But still, the games do not load me. I mean if I move the roms from snesmsu1 to snes if they work. or from cps1 to fba_libreto also work.

@paradadf something like this appears

Configurations generated by Recalbox

snesmsu1.emulator=libretro
snesmsu1.core=snes9x
snesmsu1.flatfolder=0
snesmsu1.sort=0

@paradadf The same symptom appears in the menu but does not load the games.
they only work by modifying the systems already added.
but keeping this line specific to any system.

<name> *** </ name>

Example.

<system>
<fullname>SNES MSU-1</fullname>
<name><name>satellaview</name>
<path>/recalbox/share/roms/snesmsu1</path>
<extension>.bs .BS .smc .SMC .sfc .SFC .zip .ZIP</extension>
<command>python /usr/lib/python2.7/site-packages/configgen/emulatorlauncher.pyc %CONTROLLERSCONFIG% -system %SYSTEM% -rom %ROM% -emulator %EMULATOR% -core %CORE% -ratio %RATIO% %NETPLAY%</command>
<platform>snesmsu1</platform>
<theme>snesmsu1</theme>
<emulators>
<emulator name="libretro">
<cores>
<core>snes9x</core>
</cores>
</emulator>
</emulators>
</system>

@paradadf Ok I'm going to do that. What line do I have to edit in recalbox.conf?

@paradadf With MSU-1 I made a clone of the SNES entry by varying fields like "snes" with "snesmsu1". it also happens to me with CPS
I take this line as a reference

ORIGINAL

<system>
<fullname>FinalBurn Alpha</fullname>
<name>fba_libretro</name>
<path>/recalbox/share/roms/fba_libretro</path>
<extension>.zip .ZIP .fba .FBA .7z .7Z</extension>
<command>python /usr/lib/python2.7/site-packages/configgen/emulatorlauncher.pyc %CONTROLLERSCONFIG% -system %SYSTEM% -rom %ROM% -emulator %EMULATOR% -core %CORE% -ratio %RATIO% %NETPLAY%</command>
<platform>arcade</platform>
<theme>fba_libretro</theme>
<emulators>
<emulator name="libretro">
<cores>
<core>fbalpha</core>
</cores>
</emulator>
</emulators>
</system>

CPS MODIFICADA

<system>
<fullname>CPS</fullname>
<name>cps</name>
<path>/recalbox/share/roms/cps</path>
<extension>.zip .ZIP .fba .FBA .7z .7Z</extension>
<command>python /usr/lib/python2.7/site-packages/configgen/emulatorlauncher.pyc %CONTROLLERSCONFIG% -system %SYSTEM% -rom %ROM% -emulator %EMULATOR% -core %CORE% -ratio %RATIO% %NETPLAY%</command>
<platform>cps</platform>
<theme>cps</theme>
<emulators>
<emulator name="libretro">
<cores>
<core>fbalpha</core>
</cores>
</emulator>
</emulators>
</system>

But it gives me the same result, it appears in the menu and in the list of games too. but when you give it a game, it does not load it.

Good companions, I followed a tutorial to add more systems to the recalbox in this case the SNES MSU- 1
This being the line that I added

<system>
<fullname>SNES MSU-1</fullname>
<name>snesmsu1</name>
<path>/recalbox/share/roms/snesmsu1</path>
<extension>.st .ST .smc .SMC .sfc .SFC .fig .FIG .zip .ZIP</extension>
<command>python /usr/lib/python2.7/site-packages/configgen/emulatorlauncher.pyc %CONTROLLERSCONFIG% -system %SYSTEM% -rom %ROM% -emulator %EMULATOR% -core %CORE% -ratio %RATIO% %NETPLAY%</command>
<platform>snesmsu1</platform>
<theme>snesmsu1</theme>
<emulators>
<emulator name="libretro">
<cores>
<core>snes9x</core>
</cores>
</emulator>
</emulators>
</system>

All right up there, I appear in the MENU, the games also, in advanced configuration of the emulator also appear the "core"
but when you give it "launch game" it pretends to load it but it returns me to the list of the games again. If I move the roms from snesmsu1 to snes if they work then it's not a problem for the roms ..
I'm using recalbox 6.0 in RPI 3b +
HELP :(

Pd: Translated from Spanish with google translator