Update Firmware Modem Zte Zxdsl 831
[Ayuda!] Modem-roter ZTE ZXDSL 831ii Upgrade Firmware. Hace unos dias Speedy de Argentina, me entrego un Modemrouter ZTE ZXDSL el cual posee un firmware.
Thanks for the reply Dane, I will occasionally access the modem by remotely reconfiguring the router it's attached to to check on transmission errors and what connection rate it's attaining. There is bad/old wiring somewhere on the ATT&T side; and I will end up with the odd speed or connection issue every now and then. So I suppose, I wasn't thinking initially that the way you guys have it configured out of the box technically limits the issue to those with physical access to it.
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Zxdsl 831cii
But there is still something discerning about viewing the HTML source the of login page and seeing my login credentials there. Given that the manufacturer has already fixed the problem, I would certainly feel better if you passed the new firmware update on to us end-users. Private-sector entities in the United States are strongly encouraged to consider the long-term security risks associated with doing business with either ZTE or Huawei for equipment or services. Network providers and systems developers are strongly encouraged to seek other vendors for their projects. Based on available classified and unclassified information, Huawei and ZTE cannot be trusted to be free of foreign state influence and thus pose a security threat to the United States and to our systems. The full report basically says that these guys are bad news and should be avoided at all costs; they are accused of espionage, intellectual property theft, and building backdoors into their hardware. So my original post about a security exploit in the modem might not be correct, given their track record it sounds like ZTE could have intentionally built this into their modems.
When I first found out about the exploit, it seemed like an incredibly simple thing to mess up. You can read the whole thing here: There's also an article on Ars Technica:. Mwedel wrote: Note that the ZTE modem I had for a couple years starting getting dropouts and needing rebooting, and it was just because the modem was crapping out (this was several years ago), so it is entirely possible that us the problem you are having.
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I had the same issue too. The modem would periodically lose sync for 5 minutes at a time for about a week, before it completely crapped out.
There are test points on the bottom of the PCB with clearly labeled supply levels. It turns out one of the electrolytic capacitors used in a voltage regulator was dead/dried up (I think it was on the 1.2V rail). I switched it out, and now it's running fine again. Here's a scope capture of the supply rail with the bad cap.