Updated 3DS, Arm11 error

[Wily]

I just updated my homebrewed 3DS this morning without thinking, because I wanted to buy some of the games on sale on the e-shop. However, the 3DS will not not boot up and shows me the Arm11 error, saying “An exception occurred”. I’ve watched some tutorials online, and supposedly updating the Luma version to 10.2.1 fixes it. However, I’ve copied over the files onto the SD card and the error is still showing up. Since the tutorial is about a year old, I’m wondering if maybe this fix is outdated and if there’s a new solution, or if I’m just not doing it properly. Any help would be appreciated because I don’t want to have bricked my 3DS!

 

[CoolMe]

Copy and pasting the latest Luma3DS on the sdcard should work. Try booting without an sdcard, or see if it can boot into the recovery mode with the button combo A+R+L+Up(DPad).

 

[KleinesSinchen]

There are a lot of Arm11 crashes – with a lot of different reasons. The most common in the last year was
undefined instruction, Current process: pm

That is the one which can be easily repaired by replacing Luma3DS boot.firm on the SD. Even better: https://3ds.hacks.guide/restoring-updating-cfw
===========

If the problem is the well-known Arm11 crash with the process pm and replacing boot.firm didn't help it is time for SD troubleshooting:

• Hold (Select) on power on to bring up Luma3DS settings. Look at the very bottom. Does it say: "Booted from SD via B9S" – or – "Booted from CTRNAND via B9S"? The version on the SD always has the preference. If it says from CTRNAND, the boot file could not be found/read on SD.
• Quick and dirty: Try another FAT32 formatted SD containing nothing but boot.firm
• Backup your main SD
  • Reformat it to FAT32
  • Check your main SD with h2testw or F3
  • If the check shows no error, copy everything back and try again

Worst case: Bad SD reader in the console.

 

[DOrayaki]

There are a lot of Arm11 crashes – with a lot of different reasons. The most common in the last year was
undefined instruction, Current process: pm

That is the one which can be easily repaired by replacing Luma3DS boot.firm on the SD. Even better: https://3ds.hacks.guide/restoring-updating-cfw
===========

If the problem is the well-known Arm11 crash with the process pm and replacing boot.firm didn't help it is time for SD troubleshooting:

• Hold (Select) on power on to bring up Luma3DS settings. Look at the very bottom. Does it say: "Booted from SD via B9S" – or – "Booted from CTRNAND via B9S"? The version on the SD always has the preference. If it says from CTRNAND, the boot file could not be found/read on SD.
• Quick and dirty: Try another FAT32 formatted SD containing nothing but boot.firm
• Backup your main SD
  • Reformat it to FAT32
  • Check your main SD with h2testw or F3
  • If the check shows no error, copy everything back and try again

Worst case: Bad SD reader in the console.

What if the problem of Arm 11 crash is current process: loader (000000000000000000)

How can I solve it?

I have replaced the files on the lates Luma version and it didn't work


Thank you very much