[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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>> You say "I'm quite sure the sysupgrade issue is already fixed in recent snapshots."
> Do you mean there was a known issue with some releases that broke sysupgrade? My router is stuck on Lede r4335.

Well, snapshot is our development version. From time to time stuff simply breaks. Todays snapshots are r5392. I wouldn't be surprised if one of the last 1000 commits fixed the issue you are seeing.

Not sure if your r4335 is a selfbuild image or an image from the LEDE download site. In case it is self build, you might have a miss-compiled image or missing some packages.

> I'm asking because one thing I'm afraid of is bricking the router. I have no hardware skills, so if it can't be unbricked by software/ethernet connection, I'd just have to throw it away. 

You don't have much options. Sysupgrade of your currently installed image is broken, so there is no easy/risk-free way to upgrade to a recent snapshot (since tftp doesn't seem to work).
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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#comment3890