[FS#1303] Attended Sysupgrade: brcm2708 target hasn't been converted to use the new image generation code yet

[LEDE Bugs]

The following task has a new comment added:

FS#1303 - Attended Sysupgrade: brcm2708 target hasn't been converted to use the new image generation code yet
User who did this - Christian Lamparter (chunkeey)

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Hm, too bad you closed the issue report.

"The true cause for this is that the brcm2708 target hasn't been converted to use the new image generation code yet. Take a look x86 or sunxi for examples of other block-device (ie. sdcard/emmc and such) platforms which already do that."

The brcm2708 target in master/trunk has been converted to use the new image generation code in trunk/master! This was done in patch: 
[[https://git.openwrt.org/?p=openwrt/openwrt.git;a=commit;h=e79b096ee175219c072aeb8d228a07f3361c14ea|brcm2708: convert to metadata]]

That said, I tested the luci-app-attendedsysupgrade app on my Netgear WNDR3700v2 and got the same error message: "Unsupported device, release, target, subtraget or board".
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More information can be found at the following URL:
https://bugs.openwrt.org/index.php?do=details&task_id=1303#comment4187