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Community Helping Community

SRP520 Latest Beta Firmware


This is engineering build SRP520_1.01.27_007_061512_1126, which may be installed on any original SRP520 product (this firmware is not intended for use with SRP520-U product varients).

This code is provided for your evaluation use only at this time.  Support is provided only via this community and the srp500-beta alias until posting when it will be formally supported by SBSC.

Note: SRP520 Production Version 1.1(26) is currently available on  Follow the download link from, or follow this link.

What's New:

  1. Release candidate
1.1.27(006) Fixes:
  1. SRP521 reboots frequently when WiFi, VPN and Voice features enabled.
  2. CPU at 100% after 6 days operation
  3. SNMP: Incorrect sysObjectID for various SRP platforms.
1.1.27(006 New Features:
  1. Add support for Novatel USB551L 3G/4G USB modem.
  2. Add support for Huawei K3770 3G USB modem.

1.1.27(005) Fixes:
  1. Wireless Security cleared for SSIDs 1 and 2 when SSID3 added with no security.
  2. MIB incomplete when SRP527 used in Ethernet WAN mode.
  3. PPP & RPC failure after extended stress test
1.1.27(003) Fixes:
  1. VPN Connect button no longer present.
  2. Web UI issues after extended stress test
  3. Pantech UML290 stuck in set prefer mode when running old firmware.
1.1.27(002) Fixes:
  1. Voice port timezone 1 hour out.
  2. DNS attempts to use
Cisco Employee

Hi Andy,

yeah I realised .. I actually have the SRP527W-U which I bought last week just for this mobile broadband function. I upgraded the firmware to 1.2.4 but still the same issue ... is there any beta release for 1.2.4 that supports ZTE MF821 modem?


Cisco Employee

It would be possible for us to investigate integration of this modem, but we have no plans at this time.

If you can source a sample modem for us to test, we can add it to the list.  Please take a look at this internal link for more information:



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