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Any changes to ZAR_POI.BIN.inf result in an upgrade error (SMEG/SMEG+/SMEG IV2)

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I've got a SMEG/SMEG+/SMEG IV2 radar control POI update, which contains a lot of files and folders. Using my SMEG+ I've stripped all files and directories that are not required for *my* system to successfully install the update. This leaves me with the following files/directories:

  • DATA
    • BASE1
      • ZAR_POI.BIN
      • ZAR_POI.BIN.inf
    • BASE2
      • ZAR_POI.BIN
      • ZAR_POI.BIN.inf
  • SMEG_PLUS_UPG
    • contract.dat
    • UpgPlugin.out
    • UpgPlugin.out.inf


However, any changes that I make to any of the ZAR_POI.BIN.inf files, results in the upgrade to fail.

Code:

ffc80f6a
CONTINENT_ID:01
CONTINENT_NAME:EUROPE
MEDIA_NAME:MM_ZAR_2016_06_cat6
POI_PROVIDER:PSA
VERSION:20160603
CID_SIZE_32:2424832
CID_SIZE_16:1900544
CID_SIZE_8:1671168
CID_SIZE_4:1564672
CID_SIZE:1451074

Changing a number in the date, or changing the provider or the media name all results in the error message that the upgrade file is not eligible for copy. For some reason it looks like there is some kind of CRC-check applied to at least these files. But since I've stripped all files and directories that are not required, there are no other files that can provide information about the CRC of these files. The files in SMEG_PLUS_UPG directory haven't changed since a year (they are the same every month) and the ZAR_POI.BIN.inf is changed every month.

So, why is changing the ZAR_POI.BIN.inf causing the upgrade to fail?

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