It could be a fuse count mismatch. What system version are you on, and what's your fuse count? You can check your fuse count using Hekate.
If you are using an emuMMC, then being unable to boot without entering RCM first could be because there is a problem with your sysMMC.
The Switch has mechanisms in place to prevent downgrades. If you were on a higher system version and downgraded, your system version might not match your efuse count (generally, fuses get irreparably burnt when you update your system and boot normally). If this is what happened, you can't boot your system normally. You can check your fuse count using Hekate, and you can check if the fuse count comports with your current system version.
If you're using an emuMMC, then a problem with your sysMMC may be preventing your system from booting your sysMMC normally.
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If you are using SX OS, then yes, 11.0.0 is the best system version to use, and you will probably never be able to update. This means some newer games probably won't be compatible with your system in the future.
If you aren't using SX OS, then you can update to 12.1.0.
Use Tinfoil shops (if/when they're working) or install manually downloaded NSP files using TinWoo or Awoo-Installer.
i use the sx os v3.1.0 to boot programs like atmosphere in options payloads how can i boot without it
You can push Hekate or fusee-primary while you're in RCM instead of SX OS. If you're using an TX USB dongle, you can use the options menu in SX OS to load Atmosphere and other payloads.
What version of Atmosphere is reported in the system settings? The problem is with your setup, not the Switch.
I'm not 100% sure what you're asking, but you cannot load games from a USB storage device using Atmosphere. Only SX OS supports that.
You can, however, install NSP files that are located on a USB storage device, but the games themselves have to be installed to the SD card or the sysMMC.
You should be using FAT32 on your SD card, regardless of how big it is. The maximum SD size supported by the Switch is technically 2TB, since that's the biggest SDXC supports.
ok and hello still having probs i have a 128 sd card running exfat works fine try a 256 with fat 32 and exfat with copying all content from working 128 exfat and when i boot in rcm node screen flashes and no boot doing my head in again system will not boot unable i boot from rcm mode and thanks again
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