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I need extract this firmware file. I tried firmwaremodkit and binwalk. It founds two trx headers, but cannot open it.( delete start in hexedit and untrx throws segfault, fmk found nothing)...

Interesting is the constant repetition of the sequence: 00 00 11 53 48 44 52

Some tips how extract it?

http://uloz.to/xY4X3cPh/download-dwn

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    Have you searched on this site for answers? Because I remember at least two or three very similar questions. – 0xC0000022L Dec 27 '13 at 14:28
  • The repeating sequence appears to be 5[id] 00 length, where id somehow indicates how length must be interpreted. For the SHDR blocks it's always 11, all next blocks say 0480, which is might mean "4 * 0x8000" but appear to be 0x2001C bytes long. The last 4 bytes of each block look like a CRC. – usr2564301 Dec 27 '13 at 16:16
  • Yes, I searched, there are similar questions, but without a functioning solution for me...(for example this is very similar reverseengineering.stackexchange.com/questions/3228/…) but it is for different box... My file is for update over usb... – user2039228 Dec 28 '13 at 10:09
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It is an encrypted firmware of the GBR2851T Freeview HD Digital Receiver, so you cannot extract it without the proper encryption key.
If you are interested in i-CAN (ADB) internals, see the following vulnerability report http://www.security-explorations.com/materials/se-2011-01-adb.pdf.

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