DC-HSPA+ not working with Huawei E3251 (uses only one channel)

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What steps will reproduce the problem?
1. Connect Huawei E3251 DC HSPA+ USB Modem
2. Configure incl. modeswitch ans so on
3. Connect

What is the expected output? What do you see instead?
Expected is an DC-HSPA+ (dualchannel) connection with up to 42 Mbps (about 22 
Mbps at my place - testet with notebook directly).
But there is only an HSPA connection (one channel only) with about 7.5 Mbps.

What version of the product are you using?
WL500gx-1.9.2.7-d-r2624.trx 

Please provide any additional information below.

Original issue reported on code.google.com by johannes...@gmail.com on 13 Jan 2013 at 6:10

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None of us has Huawei E3251 DC HSPA+

Seems to be Wl500gx has no enough CPU resources.

Original comment by lly.dev on 14 Jan 2013 at 6:13

• Changed state: Invalid
• Added labels: Type-Support
• Removed labels: Type-Defect

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Thank´s for your fast response.
Do you know if any other DC-HSPA+ modem is working?
I will have a look at the resources in the evening.

Original comment by johannes...@gmail.com on 14 Jan 2013 at 10:06

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You can find list of modems tested by customers in /usr/share/modems.conf
Most of reports posted at wl500g.info forum.

First of all, old routers has very limited USB speed.
At second, your modem may have special initialization sequence to init 
dualchannel mode.

Original comment by lly.dev on 18 Jan 2013 at 6:42