2015-03-01 00:53:21 +00:00
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---
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created: 2009-02-02 20:55:24 +0100
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2022-01-23 17:14:59 +00:00
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language: en
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layout: redirect
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layout_old: default
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redirect_to: https://blog.mbirth.de/archives/2009/02/02/zyxel-prestige-660hw-67.html
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2015-03-01 00:53:21 +00:00
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tags:
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2022-01-23 17:14:59 +00:00
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- know-how
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- hacking
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- hardware
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- zyxel
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- prestige
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- router
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title: ZyXEL Prestige 660HW-67
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toc: false
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updated: 2009-02-02 20:55:24 +0100
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2015-03-01 00:53:21 +00:00
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---
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2022-01-23 17:14:59 +00:00
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2015-03-01 00:53:21 +00:00
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The 660HW-67 was distributed in Germany as the "WLAN Modem 100" through the Arcor ISP. It came with the firmware `QD.7`
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which seems to be originally made for AOL.
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To get the router ready for ADSL2+, I needed the `QQ.7` firmware which is the original one.
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Firmware crossgrade
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===================
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**Manual:** [dslrouter-hilfe.de](http://www.dslrouter-hilfe.de/forum/showthread.php?t=16411)
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The big problem is that the `rom-0` of the original firmware is 48 KiB whereas that of the AOL firmware is only
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*16 KiB*. Usually, you make an upgrade by updating the `rom-0` file (which contains default settings) and then update
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the firmware itself which then reads the new default settings upon the next boot. Since the router didn't accept the
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new settings, it stuck after the reboot.
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This is how it works (using the serial connector on the PCB and a terminal program):
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1. upload the new firmware file completely
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* the router will complain that the `rom-0` doesn't match and ask you to upload a new firmware
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1. upload the new firmware again but cancel the upload after about 600 KiB (~12 min at 9600 baud)
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* the router will boot into a debug mode
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1. upload the new `rom-0` file
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2022-01-23 17:14:59 +00:00
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1. upload the new firmware file
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