[FS#840] AR71xx - Recent firmware won't flash (building without errors)

[LEDE Bugs]

The following task has a new comment added:

FS#840 - AR71xx - Recent firmware won't flash (building without errors)
User who did this - Mathias Kresin (mkresin)

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According to your putty log, the issue is the currently installed LEDE version and not the image you're trying to update to:

>killall: watchdog: no process killed
Commencing upgrade. All shell sessions will be closed now.
Command failed: Method not found

Something is clearly wrong with the currently installed image.

Please follow https://wiki.openwrt.org/toh/tp-link/tl-wr841nd#tftp_recovery_via_bootloader_for_v8_v9_v10_v11_v12 to upgrade to a recent snapshot via tftp recovery.

I'm quite sure the sysupgrade issue is already fixed in recent snapshots.

Please report any results here.
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More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=840#comment3878