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| x1x to x45/x50 All Siemens mobile starting from S6, S10, ... up to C45, S45, ME45, SL42, SL45(i), A50, CL50, M50, MT50. |
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11-05-2002, 05:00
| #1 (permalink) |
| No Life Poster  Join Date: Mar 2002 Location: -[r0]- Age: 42
Posts: 835
Member: 9891 Status: Offline Thanks: 0
Thanked 2 Times in 2 Posts
| Siemens FullFlash CRC Check method Hi, there are two source could be found in the net (DarkBear's) : siemcrc.cpp and siemcrc4x.cpp, which can be used to check CRC value for CMS35 and SME45. Is there any news about C45, M50, and other model. I did try to check good flash for C45v14, SL45v52, M50 (unknown version) using those algorithm, but all said CRC in the flash is different with the calculated CRC. Do they use different algorithm, or just the location of CRC word in the full flash is different ? Thank's, rizapn |
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11-05-2002, 10:16
| #4 (permalink) | |
| Crazy Poster  Join Date: Jul 2002 Location: Russia Age: 29
Posts: 57
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| Re: Siemens FullFlash CRC Check method Quote:
Disable the first CRC check (exactly dying after it). D74F4: 3D CC D74F5: 0A 00 D7502: 3D CC D7503: 03 00 Disable the second CRC check. DBBFE: 2D 0D Enable NetMonitor. 9FDF6: 2D 0D | |
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11-06-2002, 00:30
| #5 (permalink) | |
| Freak Poster Join Date: Oct 2001 Age: 40
Posts: 103
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| Quote:
 because I dont understand why after change any bytes in EEPROM soft calculate another CRC ? | |
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11-06-2002, 00:53
| #6 (permalink) | |
| Insane Poster Join Date: May 2002
Posts: 64
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| OK......send it! Wind Quote:
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11-06-2002, 19:09
| #8 (permalink) |
| Crazy Poster Join Date: Sep 2002
Posts: 59
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| Hi, ACID[mrp] wrote a new program which includes darkbear's crc calculator and the secand crc check so here it is http://www.minet.uni-jena.de/~holg/crc_gui_setup.exe |
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11-07-2002, 17:50
| #9 (permalink) | |
| Freak Poster Join Date: Oct 2001 Age: 40
Posts: 103
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| Quote:
Probably I have any trouble with my mailbox because I don't recive this source (siemenscrc.cpp ....). Can You send me again to kaczor@hot.pl ? Thx | |
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11-08-2002, 08:26
| #11 (permalink) |
| No Life Poster Join Date: Mar 2002 Location: -[r0]- Age: 42
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| Hi, my reason to ask this CRC question is to build a software for full-flash modification (such as ringtone and icons) for any firmware (not only x35 like my previous x35fft). After some trial, I came to this conclution : *) the main CRC calculation is : CRC1 = W1 xor W2, and CRC2 = W1 + W2 *) *IF* all Siemens firmware CRC algo is based on that, I think another idea to correct CRC after doing some firmware modification (without knowing the *exact* CRC calculation) is to add some more data (in my trial, 3 word are enough), so : CRC1new xor A xor B xor C = CRC1old, and CRC2new + A + B + C = CRC2old ... (first I try with only A and B, but always impossible to get the right value). I did try with both siemCRC and siemCRC4x, and this idea is OK. The CRC after modifying some data, plus that ABC data is exactly same with the previous/good ones. Any suggestion ? Regards, rizapn Last edited by rizapn; 11-08-2002 at 08:38. |
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