[FS#805] WNDR4700 - latest r4190 from r4188 - upgrade not working

[LEDE Bugs]

The following task has a new comment added:

FS#805 - WNDR4700 - latest r4190 from r4188 - upgrade not working
User who did this - build000 (build000)

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Confirm - only NAND flash machines - other, with SPI/NOR flash, my routers flashing properly.
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More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=805#comment2681