I am working on firmware update file prod-build-Isat2-V02.00.03-DFU.fp2. I extracted it and I've got some bin files. I analyzed these binary files with binwalk:

binwalk -E RDA-533.bin

The entropy of these bin files didn't give any information and when I opened these files with IDA, it didn't give subblocks and functions. It seems these files are compressed or encrypted. How can I analyze these bin files as efficiently as possible?


1 Answer 1


You can find files File1.bin ... File6.bin in "C:\temp" directory after running IsatPhone 2 Firmware Upgrade Tool and selecting firmware. It does not need a connection to physical device, just firmware and tool.Unfortunately you can't decrypt these files in contrast to "IsatPhone Pro" model in which files were not encrypted.

  • Thanks for your response, I statistically analyzed extracted files, what are your reasons that file is encrypted? Because of entropy of extracted file, Doesn't it compressed or encrypted?
    – h msvi
    Apr 29, 2019 at 11:31
  • I can't share my report related to this research due to NDA. You can trust me or not, but I'm 100% sure this firmware is encrypted. Apr 29, 2019 at 20:57
  • Thanks for helpful answer, but I'm studying on working encryption methods of firmware updates generally. Would it be possible if you give me a sample of firmware with specific encryption method for my work?
    – h msvi
    Apr 30, 2019 at 5:33

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