Homebrew Clarification Thread - What is going on?

Substance12 · Dec 31, 2015

Mrrraou said:
Just follow tutorials after downgrading. CFW installation isn't related to the topic.

Ok, thanks for clarifying.

WallK · Dec 31, 2015

Hmm, will I lose my menuhax if I downgrade? I don't have any other entrypoints

Mrrraou · Dec 31, 2015

WallK said:
Hmm, will I lose my menuhax if I downgrade? I don't have any other entrypoints

You will, but 9.2 doesn't have the browser update nag. So it's safe, and you can use GW's browser exploit and browserhax.

WallK · Dec 31, 2015

Mrrraou said:
You will, but 9.2 doesn't have the browser update nag. So it's safe, and you can use GW's browser exploit and browserhax.

Thank you! Still, I think I was too fast with selling my Sky3DS

Hikenkami · Dec 31, 2015

WallK said:
Thank you! Still, I think I was too fast with selling my Sky3DS

Why so? I canceled the preorder of mine when I heard about this news. What does the Sky3DS that a downgrade to 9.2 and then installing a CFW doesn't?

WallK · Dec 31, 2015

Hikenkami said:
Why so? I canceled the preorder of mine when I heard about this news. What does the Sky3DS that a downgrade to 9.2 and then installing a CFW doesn't?

Launching games, so I can transfer my saves to the cfw backups

Harvest God · Dec 31, 2015

um you can download roms, convert them to cias on 9.2, and just install those cias to the home menu

hellionz · Dec 31, 2015

Hikenkami said:
Why so? I canceled the preorder of mine when I heard about this news. What does the Sky3DS that a downgrade to 9.2 and then installing a CFW doesn't?

NinJhax for have an entrypoint on 9.2???

WallK · Dec 31, 2015

Harvest God said:
um you can download roms, convert them to cias on 9.2, and just install those cias to the home menu

What to do with my old beloved saves for acnl, pokemons and other games that I played on Sky3DS?

Mrrraou · Dec 31, 2015

hellionz said:
NinJhax for have an entrypoint on 9.2???

There is the web browser...

--------------------- MERGED ---------------------------

WallK said:
What to do with my old beloved saves for acnl, pokemons and other games that I played on Sky3DS?

SaveDataFiler

Hikenkami · Dec 31, 2015

So this tutorial explaining how to install the haxes without needing a Sky3DS wouldn't work?

http://gbatemp.net/threads/tutorial...ncluding-emunand-coldboot-cia-manager.405589/

hellionz · Dec 31, 2015

Mrrraou said:
There is the web browser...

--------------------- MERGED ---------------------------

SaveDataFiler

If you have an sky3ds....dun need another entrypoint than ninjhax

WallK · Dec 31, 2015

Mrrraou said:
SaveDataFiler

I still need an actual sky3ds for this

TheZoroark007 · Dec 31, 2015

Mrrraou said:
You will, but 9.2 doesn't have the browser update nag. So it's safe, and you can use GW's browser exploit and browserhax.

And on New 3DS too ?

Syphurith · Dec 31, 2015

Eh. @Mrrraou I've something to ask this time. About arm9loaderhax.
I've checked the EmuNAND backup of my O3DS, of version 10.3.0. After decrypted it with Decrypt9 and trimmed the file to actual size, the FIRM0 and FIRM1 have a same size.
Don't know if the decrypted and trimmed size differs on a N3DS. Yes it is said to be decrypted with a Key#2, but it should be decrypted with NAND keyslot 0x06 first.
The O3DS haven't get thus a encryption layer, so I suppose this size comparsion result is different from N3DS.
The FIRM0 is indeed a FIRM structure file for my O3DS, but still differs from the FIRM in decrypted NATIVE_FIRM title. Don't know what happened.
So if anyone have a N3DS could you use d0k3 Decrypt9 WIP to decrypt the "Emunand options -> Decrypt Paritions -> FIRM0 and FIRM1", and trim the lasting 00s?
If you don't want to trim the file manually here is C source of a tool: You can use GCC to compile it, and pass the decrypted (partially, isn't it) file as argument.

Code:

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#define BLK_LEN_DEFAULT ((size_t)0x00000100)   //Unit Size for Checking 256B To check it carefully
#define BLK_LEN_WRITEIO ((size_t)0x00100000)   //Unit Size for Writing  1MB  To avoid too much writes

size_t TrimSize(char* name, size_t blklen, size_t* filelen) {
   FILE *fptr = NULL;
   char *fbuf = NULL;
   size_t flen = 0, blen = BLK_LEN_DEFAULT, rlen = 0;
   size_t bcnt = 0, boff = 0, bidx = 0, bchk = 0;
  
   if (blklen) blen = blklen;
   fbuf = (char*)calloc(1, blen);
   if (!name) {printf("[DBG:]Null File Name Buffer. SKIP.\n");return 0;}
   fptr = fopen(name, "rb");
   if (!fptr) {printf("[DBG:]File %s could not be opened. SKIP.\n");return 0;}
   printf("[DBG:]F:%s.B:0x%08X.", name, blen);
   fseek(fptr, 0, SEEK_END);
   flen = ftell(fptr);
   if (filelen) *filelen = flen;
   printf("L:0x%08X..", flen);
   boff = flen % blen;
   bcnt = flen / blen;
   printf("*:0x%08X.+:0x%08X..", bcnt, boff);
  
   if (boff) bcnt ++;
   for (bidx = bcnt; bidx > 0; bidx --) {
     fseek(fptr, bidx * blen, SEEK_SET);
     fread(fbuf, 1, boff, fptr);
     for (bchk = boff; bchk > 0; bchk --) {
       if (fbuf[bchk - 1]) {
         printf("R:0x%08X,@I:0x%08X,C:0x%08X\n",bidx*blen, bidx, bchk);
         fclose(fptr);
         free(fbuf);
         return bidx * blen + bchk;
       }
     }
     boff = blen;
   }
   printf("E:0x%08X.R:0x%08X\n",bidx*blen);
   fclose(fptr);
   free(fbuf);
   return 0;
}

int main(int argc, char** argv) {
   //FileSize: Untouched, Trimmed. Iterator. Trimmed FileName Length. Block Size, Block Count.
   size_t olen = 0, nlen = 0, i = 0, xlen = 0, blen = 0, bcnt = 0, clen = 0;
   //File pointer: Untouched, Trimmed.
   FILE *optr = 0, *nptr = 0;
   //Trimmed FileName. File content buffer.
   char *xbuf = 0, *fbuf = 0;
   printf("[INFO]Padding 00 Simple Trimmer.\n");
   if (argc < 1) {
     printf("[HELP]Pass the filenames as arguements. Trimmed file would be created in same directory.\n");
     exit(0);
   }
   fbuf = (char*)calloc(1, BLK_LEN_WRITEIO);
   for (i = 1; i < argc; i ++) {
     nlen = TrimSize(argv[i], BLK_LEN_DEFAULT, &olen);
     if (nlen == olen) {
       printf("[INFO]File %s could not be trimmed cause it is filled fully.\n", argv[i]);
       continue;
     }
     if (!nlen) {
       printf("[ERR:]File %s can not access, or is a empty file after trimmed.\n", argv[i]);
       continue;
     }
     if (optr) {fclose(optr); optr = 0;}
     if (nptr) {fclose(nptr); nptr = 0;}  
     xlen = strlen(argv[i]);
     if (xbuf) {free(xbuf); xbuf = 0;}
     xbuf = (char*)calloc(1, xlen + 8);
    
     snprintf(xbuf, xlen + 8, "%s.trim", argv[i]);
     optr = fopen(argv[i], "rb");
     nptr = fopen(xbuf, "wb");
     if ((!optr)||(!nptr)) {
       printf("[ERR:]Reading '%s' or Writing '%s' failed. Please check your access.\n", argv[i], xbuf);
       continue;
     }
     printf("[INFO]Trimming file %s with size 0x%08X to 0x%08X..", argv[i], olen, nlen);
     blen = BLK_LEN_WRITEIO;
     bcnt = nlen / blen;
     xlen = nlen;
     if (nlen % blen) bcnt ++;
     for (i = 0; i < bcnt; i ++) {
       if (xlen < blen) blen = xlen;
       fread(fbuf, 1, blen, optr);
       clen = fwrite(fbuf, 1, blen, nptr);
       fflush(nptr);
       xlen -= blen;
       if (clen != blen) {printf("F:%08X/%08X.FAIL\n",bcnt,i);}
     }
     printf("B:%08X/%08X.DONE.\n",bcnt,i);
     fflush(stdout);
   }
   if (xbuf) {free(xbuf); xbuf = 0;}
   if (optr) {fclose(optr); optr = 0;}
   if (nptr) {fclose(nptr); nptr = 0;}
  
   printf("[INFO]All Files Trimmed. Congratulations.\n");
   return 0;
}

Hope the arm9loader isn't a dream for us. The file size difference would also tell you how much space can be used for that payload if you want to be a brave.
EDIT: Note that the difference may be only for 9.6+ N3DS users. However even a bricked EmuNAND could contains valid partitions (just can not be decrypted) for this test.
EDIT: So if you dare to try the 9.6+ EmuNAND, first backup your working emunand, update, (no need to launch it actually) use decrypt9, restore emunand.

Mrrraou · Dec 31, 2015

TheZoroark007 said:
And on New 3DS too ?

It's 9.2. There are no updates nags on the browser.

And go.gateway-3ds.com

--------------------- MERGED ---------------------------

Syphurith said:

Eh. @Mrrraou I've something to ask this time. About arm9loaderhax.
I've checked the EmuNAND backup of my O3DS, of version 10.3.0. After decrypted it with Decrypt9 and trimmed the file to actual size, the FIRM0 and FIRM1 have a same size.
Don't know if the decrypted and trimmed size differs on a N3DS. Yes it is said to be decrypted with a Key#2, but it should be decrypted with NAND keyslot 0x06 first.
The O3DS haven't get thus a encryption layer, so I suppose this size comparsion result is different from N3DS.
The FIRM0 is indeed a FIRM structure file for my O3DS, but still differs from the FIRM in decrypted NATIVE_FIRM title. Don't know what happened.
So if anyone have a N3DS could you use d0k3 Decrypt9 WIP to decrypt the "Emunand options -> Decrypt Paritions -> FIRM0 and FIRM1", and trim the lasting 00s?
If you don't want to trim the file manually here is C source of a tool: You can use GCC to compile it, and pass the decrypted (partially, isn't it) file as argument.

Code:

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#define BLK_LEN_DEFAULT ((size_t)0x00000100)   //Unit Size for Checking 256B To check it carefully
#define BLK_LEN_WRITEIO ((size_t)0x00100000)   //Unit Size for Writing  1MB  To avoid too much writes

size_t TrimSize(char* name, size_t blklen, size_t* filelen) {
   FILE *fptr = NULL;
   char *fbuf = NULL;
   size_t flen = 0, blen = BLK_LEN_DEFAULT, rlen = 0;
   size_t bcnt = 0, boff = 0, bidx = 0, bchk = 0;
 
   if (blklen) blen = blklen;
   fbuf = (char*)calloc(1, blen);
   if (!name) {printf("[DBG:]Null File Name Buffer. SKIP.\n");return 0;}
   fptr = fopen(name, "rb");
   if (!fptr) {printf("[DBG:]File %s could not be opened. SKIP.\n");return 0;}
   printf("[DBG:]F:%s.B:0x%08X.", name, blen);
   fseek(fptr, 0, SEEK_END);
   flen = ftell(fptr);
   if (filelen) *filelen = flen;
   printf("L:0x%08X..", flen);
   boff = flen % blen;
   bcnt = flen / blen;
   printf("*:0x%08X.+:0x%08X..", bcnt, boff);
 
   if (boff) bcnt ++;
   for (bidx = bcnt; bidx > 0; bidx --) {
     fseek(fptr, bidx * blen, SEEK_SET);
     fread(fbuf, 1, boff, fptr);
     for (bchk = boff; bchk > 0; bchk --) {
       if (fbuf[bchk - 1]) {
         printf("R:0x%08X,@I:0x%08X,C:0x%08X\n",bidx*blen, bidx, bchk);
         fclose(fptr);
         free(fbuf);
         return bidx * blen + bchk;
       }
     }
     boff = blen;
   }
   printf("E:0x%08X.R:0x%08X\n",bidx*blen);
   fclose(fptr);
   free(fbuf);
   return 0;
}

int main(int argc, char** argv) {
   //FileSize: Untouched, Trimmed. Iterator. Trimmed FileName Length. Block Size, Block Count.
   size_t olen = 0, nlen = 0, i = 0, xlen = 0, blen = 0, bcnt = 0, clen = 0;
   //File pointer: Untouched, Trimmed.
   FILE *optr = 0, *nptr = 0;
   //Trimmed FileName. File content buffer.
   char *xbuf = 0, *fbuf = 0;
   printf("[INFO]Padding 00 Simple Trimmer.\n");
   if (argc < 1) {
     printf("[HELP]Pass the filenames as arguements. Trimmed file would be created in same directory.\n");
     exit(0);
   }
   fbuf = (char*)calloc(1, BLK_LEN_WRITEIO);
   for (i = 1; i < argc; i ++) {
     nlen = TrimSize(argv[i], BLK_LEN_DEFAULT, &olen);
     if (nlen == olen) {
       printf("[INFO]File %s could not be trimmed cause it is filled fully.\n", argv[i]);
       continue;
     }
     if (!nlen) {
       printf("[ERR:]File %s can not access, or is a empty file after trimmed.\n", argv[i]);
       continue;
     }
     if (optr) {fclose(optr); optr = 0;}
     if (nptr) {fclose(nptr); nptr = 0;} 
     xlen = strlen(argv[i]);
     if (xbuf) {free(xbuf); xbuf = 0;}
     xbuf = (char*)calloc(1, xlen + 8);
   
     snprintf(xbuf, xlen + 8, "%s.trim", argv[i]);
     optr = fopen(argv[i], "rb");
     nptr = fopen(xbuf, "wb");
     if ((!optr)||(!nptr)) {
       printf("[ERR:]Reading '%s' or Writing '%s' failed. Please check your access.\n", argv[i], xbuf);
       continue;
     }
     printf("[INFO]Trimming file %s with size 0x%08X to 0x%08X..", argv[i], olen, nlen);
     blen = BLK_LEN_WRITEIO;
     bcnt = nlen / blen;
     xlen = nlen;
     if (nlen % blen) bcnt ++;
     for (i = 0; i < bcnt; i ++) {
       if (xlen < blen) blen = xlen;
       fread(fbuf, 1, blen, optr);
       clen = fwrite(fbuf, 1, blen, nptr);
       fflush(nptr);
       xlen -= blen;
       if (clen != blen) {printf("F:%08X/%08X.FAIL\n",bcnt,i);}
     }
     printf("B:%08X/%08X.DONE.\n",bcnt,i);
     fflush(stdout);
   }
   if (xbuf) {free(xbuf); xbuf = 0;}
   if (optr) {fclose(optr); optr = 0;}
   if (nptr) {fclose(nptr); nptr = 0;}
 
   printf("[INFO]All Files Trimmed. Congratulations.\n");
   return 0;
}

Hope the arm9loader isn't a dream for us. The file size difference would also tell you how much space can be used for that payload if you want to be a brave.
EDIT: Note that the difference may be only for 9.6+ N3DS users. However even a bricked EmuNAND could contains valid partitions (just can not be decrypted) for this test.
EDIT: So if you dare to try the 9.6+ EmuNAND, first backup your working emunand, update, (no need to launch it actually) use decrypt9, restore emunand.

Thanks, it's nice to see that you are doing some research. So, what can I do ? There aren't any questions, so... ^^' And I don't have any N3DS, sorry about that :/

ric. · Dec 31, 2015

hellionz said:
If you have an sky3ds....dun need another entrypoint than ninjhax

Or you could not spend 80 bucks on a card and just do it from the console's web browser.

bi388 · Dec 31, 2015

I have a sky3ds and im going to keep it as I always might pick up a new console after 10.4 or a friend might ask me to hack their console, but I can see why other people might just sell theirs.

Syphurith · Dec 31, 2015

Mrrraou said:
Happy NEW year~
--------------------- MERGED ------------------------------------------------ MERGED ------------------------------------------------ MERGED ------------------------------------------------ MERGED ------------------------------------------------ MERGED ---------------------------
--------------------- MERGED ------------------------------------------------ MERGED ------------------------------------------------ MERGED ------------------------------------------------ MERGED ------------------------------------------------ MERGED ---------------------------
Thanks, it's nice to see that you are doing some research. So, what can I do ? There aren't any questions, so... ^^' And I don't have any N3DS, sorry about that :/

Thanks for reply. That's not a research indeed (yes what i have is only an O3DS), i was wondering about the FIRM and @d0k3 helped me with his tool.
You might want to kill some time, such as calculating the possibility of a 16 bits value could be interpreted as a BL (find yourself the instruction manual yeah).
~~And then, if you can find the arm9 offset, and differ the two binaries size, try to calculate the possibility again.~~ No real coding skill needed.

Mrrraou · Dec 31, 2015

Syphurith said:
Thanks for reply. That's not a research indeed (yes what i have is only an O3DS), i was wondering about the FIRM and @d0k3 helped me with his tool.
You might want to kill some time, such as calculating the possibility of a 16 bits value could be interpreted as a BL (find yourself the instruction manual yeah).
~~And then, if you can find the arm9 offset, and differ the two binaries size, try to calculate the possibility again.~~ No real coding skill needed.

Your quote is kinda weird ^^'
Didn't someone calculated this before ? And isn't the ARM9 entrypoint written somewhere in the FIRM header ?

Homebrew Clarification Thread - What is going on?

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