[FS#3931] [wndr3700v4] unable to upgrade from ar71xx to ath79

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FS#3931 - [wndr3700v4] unable to upgrade from ar71xx to ath79
User who did this - bob (bobc)

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Hi, I have flashed 21.02-rc3 on a netgear wndr3700v4.

sysupgrade did not work and left the router in a dysfunctional state, though the bootloader still worked.

To recover, I flashed the **factory** image via tftp.

I followed [[https://openwrt.org/toh/netgear/wndr3700#recovery_flash_in_failsafe_mode|these tftp instructions]], especially the subsection titled **alternative advice**.

[[https://github.com/jclehner/nmrpflash|nmrpflash]] appears to be a simpler tftp utility, but I haven't yet tried it. 

Good luck!
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More information can be found at the following URL:
https://bugs.openwrt.org/index.php?do=details&task_id=3931#comment9941

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