[FS#1175] Can't flash ARV7506PW11 from recovery mode

[LEDE Bugs]

The following task has a new comment added:

FS#1175 - Can't flash ARV7506PW11 from recovery mode
User who did this - Mathias Kresin (mkresin)

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> I rebooted the router into recovery mode, tried to upgrade using the lede-17.01.4-lantiq-xway-ARV7506PW11-squashfs-sysupgrade.bin firmware

Flashing from the recovery mode isn't supported and most likely will never be supported. It requires a signed image which we do not have. The image used with recovery mode must not exceed 3776Kbytes. Our usual images are already bigger than that.

The "Flash to OpenWRT without opening the device" guide advices you to download a prebuild/custom/external image for using the recovery mode.

> download a prebuild, signed firmware image from http://nanl.de/todo...

Furthermore, a few lines up is fat warning to not go this way:

> ** WIP: DO NOT FOLLOW THIS INFORMATIONS AT THE MOMENT: SIGNED FIRMWARE IS NOT WORKING (uboot can't find the ethernet devices, a bugreport is opened, stay tuned, we are working on this issue) **.

Long story short, flashing is only supported via serial console and requires to update the bootloader as well. Before considering to do so, please read FS#975.
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More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=1175#comment3876