[FS#3294] CPE510/520 sysupgrade-image on server/website seems to be incorrect/not functional

[OpenWrt Bugs]

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FS#3294 - CPE510/520 sysupgrade-image on server/website seems to be incorrect/not functional
User who did this - Matthias Schiffer (NeoRaider)

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Unlike the factory image, the sysupgrade image is a raw flash image. It starts with the kernel, which happens to be in ELF format on this platform. The size difference between the images is also expected.

We had to change the flash layout for CPE210/CPE510/... with OpenWrt 18.06.0, requiring some adjustments to the sysupgrade code that checks image validity as well. The validation code update was backported to LEDE 17.01.5.

You have two options for the update:
1. First upgrade to 17.01.5, then to a newer OpenWrt release
2. Use sysugrade -F to skip the validation (somewhat more dangerous)

In both cases, the sysupgrade image is the correct one - the factory image has different format that is only understood by TP-Link's stock firmware.
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More information can be found at the following URL:
https://bugs.openwrt.org/index.php?do=details&task_id=3294#comment8675

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