Hi
I've finally decided to move from sxos to atmosphere.
Thanks to all the information found, I've managed to deploy atmosphere 1.2.4 with last sigpatches (checked many times) with hekate 5.6.5 and emunand/emummc firmware 13.1.0.
I've also upgraded sysnand to 13.1.0. (I don't play online and my account is already banned
)
When I launched Atmosphere through SXOS with dongle and hekate, I had an error saying: "failed to get TSEC keys"
So I've set up a boot.dat by converting fusee.bin with sx-custom-boot.dat-maker and then Atmosphere started fine with SXOS dongle.
The OS displayed by the system menu is : 13.1.0 | AMS 1.2.4 | S
The problem is that many games refuses to start (SSBU, nickelodeon brawl, beat me).
I've got a message telling : game can't start, retry from home menu. (sorry it's not the exact term, source is in french).
Other games started fine (golf story, tower of babel).
I'm tired of 2 days trying everything to make it works:
Conclusion of point 2 tests: I managed to make SSBU with update 13.0 works (Tinfoil install without version check) BUT after ATM reboot the error came back. (I just wanted to throw the switch against the wall ...
). If only we could have an error log to debug these game crashes... 
Conclusion of point 4: I don't understand why and how but when I put a new empty SD, all the games I deleted from the system came back. Maybe it means I was on emmunand and with the new SD I get on the sysnand ??
The last test I wanted to do is to factory reset the switch and retry to install.
Just before that I wanted to ask if someone could please help, it would be reeeeeeaaaaalllly helpful.
I've finally decided to move from sxos to atmosphere.
Thanks to all the information found, I've managed to deploy atmosphere 1.2.4 with last sigpatches (checked many times) with hekate 5.6.5 and emunand/emummc firmware 13.1.0.
I've also upgraded sysnand to 13.1.0. (I don't play online and my account is already banned
When I launched Atmosphere through SXOS with dongle and hekate, I had an error saying: "failed to get TSEC keys"
So I've set up a boot.dat by converting fusee.bin with sx-custom-boot.dat-maker and then Atmosphere started fine with SXOS dongle.
The OS displayed by the system menu is : 13.1.0 | AMS 1.2.4 | S
The problem is that many games refuses to start (SSBU, nickelodeon brawl, beat me).
I've got a message telling : game can't start, retry from home menu. (sorry it's not the exact term, source is in french).
Other games started fine (golf story, tower of babel).
I'm tired of 2 days trying everything to make it works:
- download sigpatches from other sources or directly from apps
- install with tinfoil, goldleaf, awoo with different settings:
- with/without version check
- with without rewrite NCA
- on nand/on SD
- delete all the games (not the backups) from system and reinstall
- delete all the games (not the backups) from system and reinstall with a new empty sd card (without emmunand)
- Test with other nsp to check if all games fail or not
Conclusion of point 2 tests: I managed to make SSBU with update 13.0 works (Tinfoil install without version check) BUT after ATM reboot the error came back. (I just wanted to throw the switch against the wall ...

Conclusion of point 4: I don't understand why and how but when I put a new empty SD, all the games I deleted from the system came back. Maybe it means I was on emmunand and with the new SD I get on the sysnand ??
The last test I wanted to do is to factory reset the switch and retry to install.
Just before that I wanted to ask if someone could please help, it would be reeeeeeaaaaalllly helpful.