tested on a o3dsxl on 9.2 , updated to 10.5 ; used the program to go to 10.2 and downgrade succefully to 9.2 again
just got a little problem with ctrtool as it was giving me : no valid win 32 application , got one from those 3ds to cia converting tools (attached below)
 

Attachments

It has been done, the firmware that is contained in 10.5 but exploit sysupdater back to work and the downgrade is done! YouTube yakaracolombia
 
Well, posts have to be in English, but I guess with English subtitles it should be alright.
This clk-pin is really a pain, but great that you or the maker of the video soldered it without problems, mine is already that damaged from the many soldering that I had to use the pin under the gameslot...
One can also route the cables through the IR-part of the 3DS case, then you can close the case completely.
 
Code:
C:\Users\Adam\Downloads\10.4 & 10.5 Downgrade\autofirm>start.bat

C:\Users\Adam\Downloads\10.4 & 10.5 Downgrade\autofirm>3DSFirm.exe -d nand.bin f
irm0.bin firm1.bin

C:\Users\Adam\Downloads\10.4 & 10.5 Downgrade\autofirm>ctrtool.exe --contents=co
ntent1 firmoriginal.cia

C:\Users\Adam\Downloads\10.4 & 10.5 Downgrade\autofirm>rename content1* content1


C:\Users\Adam\Downloads\10.4 & 10.5 Downgrade\autofirm>ctrtool.exe --contents=co
ntent2 firmnuevo.cia

C:\Users\Adam\Downloads\10.4 & 10.5 Downgrade\autofirm>rename content2* content2


C:\Users\Adam\Downloads\10.4 & 10.5 Downgrade\autofirm>ctrtool.exe --exefsdir=ex
efsoriginal content1

C:\Users\Adam\Downloads\10.4 & 10.5 Downgrade\autofirm>ctrtool.exe --exefsdir=ex
efsnuevo content2

C:\Users\Adam\Downloads\10.4 & 10.5 Downgrade\autofirm>xor firm0.bin ./exefsorig
inal/firm.bin

C:\Users\Adam\Downloads\10.4 & 10.5 Downgrade\autofirm>xor firm0.bin.out ./exefs
nuevo/firm.bin

C:\Users\Adam\Downloads\10.4 & 10.5 Downgrade\autofirm>xor firm1.bin ./exefsorig
inal/firm.bin

C:\Users\Adam\Downloads\10.4 & 10.5 Downgrade\autofirm>xor firm1.bin.out ./exefs
nuevo/firm.bin

C:\Users\Adam\Downloads\10.4 & 10.5 Downgrade\autofirm>rename firm0.bin.out.out
firm0nuevo.bin
The system cannot find the file specified.

C:\Users\Adam\Downloads\10.4 & 10.5 Downgrade\autofirm>rename firm1.bin.out.out
firm1nuevo.bin
The system cannot find the file specified.

C:\Users\Adam\Downloads\10.4 & 10.5 Downgrade\autofirm>3DSFirm.exe -i nand.bin f
irm0nuevo.bin firm1nuevo.bin

C:\Users\Adam\Downloads\10.4 & 10.5 Downgrade\autofirm>del content*

C:\Users\Adam\Downloads\10.4 & 10.5 Downgrade\autofirm>del *.out
Could Not Find C:\Users\Adam\Downloads\10.4 & 10.5 Downgrade\autofirm\*.out

C:\Users\Adam\Downloads\10.4 & 10.5 Downgrade\autofirm>pause
Press any key to continue . . .

This is my error
 
Code:
C:\Users\Adam\Downloads\10.4 & 10.5 Downgrade\autofirm>start.bat

C:\Users\Adam\Downloads\10.4 & 10.5 Downgrade\autofirm>3DSFirm.exe -d nand.bin f
irm0.bin firm1.bin

C:\Users\Adam\Downloads\10.4 & 10.5 Downgrade\autofirm>ctrtool.exe --contents=co
ntent1 firmoriginal.cia

C:\Users\Adam\Downloads\10.4 & 10.5 Downgrade\autofirm>rename content1* content1


C:\Users\Adam\Downloads\10.4 & 10.5 Downgrade\autofirm>ctrtool.exe --contents=co
ntent2 firmnuevo.cia

C:\Users\Adam\Downloads\10.4 & 10.5 Downgrade\autofirm>rename content2* content2


C:\Users\Adam\Downloads\10.4 & 10.5 Downgrade\autofirm>ctrtool.exe --exefsdir=ex
efsoriginal content1

C:\Users\Adam\Downloads\10.4 & 10.5 Downgrade\autofirm>ctrtool.exe --exefsdir=ex
efsnuevo content2

C:\Users\Adam\Downloads\10.4 & 10.5 Downgrade\autofirm>xor firm0.bin ./exefsorig
inal/firm.bin

C:\Users\Adam\Downloads\10.4 & 10.5 Downgrade\autofirm>xor firm0.bin.out ./exefs
nuevo/firm.bin

C:\Users\Adam\Downloads\10.4 & 10.5 Downgrade\autofirm>xor firm1.bin ./exefsorig
inal/firm.bin

C:\Users\Adam\Downloads\10.4 & 10.5 Downgrade\autofirm>xor firm1.bin.out ./exefs
nuevo/firm.bin

C:\Users\Adam\Downloads\10.4 & 10.5 Downgrade\autofirm>rename firm0.bin.out.out
firm0nuevo.bin
The system cannot find the file specified.

C:\Users\Adam\Downloads\10.4 & 10.5 Downgrade\autofirm>rename firm1.bin.out.out
firm1nuevo.bin
The system cannot find the file specified.

C:\Users\Adam\Downloads\10.4 & 10.5 Downgrade\autofirm>3DSFirm.exe -i nand.bin f
irm0nuevo.bin firm1nuevo.bin

C:\Users\Adam\Downloads\10.4 & 10.5 Downgrade\autofirm>del content*

C:\Users\Adam\Downloads\10.4 & 10.5 Downgrade\autofirm>del *.out
Could Not Find C:\Users\Adam\Downloads\10.4 & 10.5 Downgrade\autofirm\*.out

C:\Users\Adam\Downloads\10.4 & 10.5 Downgrade\autofirm>pause
Press any key to continue . . .

This is my error
Windows version?
 

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