WARNING: This file has not been tested, use at your own risk. It was created using the instructions above.
The file you have created is 0x3C001B bytes long but in your created header it says 0x3C001C.
You'd better remove it from download. _________________ Kernel panic: Aiee, killing interrupt handler!
Joined: 08 May 2018 Posts: 13898 Location: Texas, USA
Posted: Mon Mar 14, 2022 15:53 Post subject:
Header should now be fixed. Please verify. FWIW, the header came directly from the DD-WRT webflash file and I looked no further (since it seemed to be the same size). Verified webflash file size to be different. Thanks for the insight, LOM! _________________ "Life is but a fleeting moment, a vapor that vanishes quickly; All is vanity"
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Linux User #377467 counter.li.org / linuxcounter.net
Well, it was not the header you should correct, it was the length of the original TP-Link firmware that was wrong.
You had lost the first byte in the stock firmware, (0x01) (and you obviously don't understand how the checksum is calculated).
Here is a file with correct header, correct length, and correct checksum: _________________ Kernel panic: Aiee, killing interrupt handler!
Joined: 08 May 2018 Posts: 13898 Location: Texas, USA
Posted: Mon Apr 04, 2022 13:43 Post subject:
I admit that on the actual specifics of what content is being checksum'd, I am ignorant as I have gone back and tried every way to run a checksum and still did not come up with the 4 bytes in your file. Could you enlighten us all so as to prevent future blunders? _________________ "Life is but a fleeting moment, a vapor that vanishes quickly; All is vanity"
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Linux User #377467 counter.li.org / linuxcounter.net
It is the 1's complement of the CRC-32 digest over the area from 0x0c to the end of the file.
The value is 32-bit big endian stored in position 0x08 - 0x0b.
Since a TP-Link bootloader stripped firmware is 0x3c0000 bytes long (4MB flash)or 0x7c0000 bytes long (8MB flash) then the checksum'ed are will be 0x3c0010 and 0x7c0010 respectively. _________________ Kernel panic: Aiee, killing interrupt handler!
I admit that on the actual specifics of what content is being checksum'd, I am ignorant as I have gone back and tried every way to run a checksum and still did not come up with the 4 bytes in your file. Could you enlighten us all so as to prevent future blunders?
Ignorant because you could have used almost any dd-wrt firmware to test your theories on, most of them contains a trx header with a correct checksum and you should not had published files for users until you could generate and verify a checksum on a dd-wrt firmware.
There is of course source code for it somewhere in the dd-wrt .svn and if you can't find it there then get it from openwrt.
Joined: 31 Jul 2021 Posts: 2146 Location: All over YOUR webs
Posted: Tue Apr 05, 2022 10:59 Post subject:
I did remove the offending attachment a few days back of the incorrect fw to prevent any side issues, sadly file had been downloaded 8 times at the time I read LOM's original reply that `length of the original TP-Link firmware was wrong` and correct file ad been attached with reply.
Joined: 08 May 2018 Posts: 13898 Location: Texas, USA
Posted: Tue Apr 05, 2022 14:18 Post subject:
@LOM: Thanks for the clarification; to explain the blunder completely, the included checksum of the file I provided was copied directly from the webflash file's header for this specific device I used for reference, which was obviously a gross error on my part. The only other thing I'm a little lost on is the specific process on how to create this checksum; or rather, is this checksum calculated against only the bootloader-stripped stock firmware or what exactly. Perhaps I am not reading your commentary as I should... _________________ "Life is but a fleeting moment, a vapor that vanishes quickly; All is vanity"
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Linux User #377467 counter.li.org / linuxcounter.net
