Huawei_E 3131_Firmware_21.157.31.01.623.B757_Romunia_RDS.dgtk. You need to use one of DC-unlocker's programs and click on button 'Enter support area'. This app will not receive any further development. Moving to PPP Widget 2 is suggested, it runs on Lollipop too (Android 5.0 and 5.1). Use your 3G modem stick.
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HUAWEI E3131 3G High Speed Surfstick 21,6Mbps Ant.CRC9//VoiceCalls/USSD/SMS
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Pre-OwnedFrom Belarusor Best OfferHUAWEI E3131 3G High Speed Surfstick 21,6Mbps Ant.CRC9//VoiceCalls/USSD/SMS NEW
Open boxFrom Russian FederationBuy It Now- Brand NewFrom FranceBuy It Now306 Sold306 Sold
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21mb/s Huawei e3131 Surfstick Data Stick 3g UMTS USB Without Simlock Black/White
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Mobile bandalarga Antenna Booster Air 3g UMTS HSPA from Huawei e3131 Set 10m
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Open boxFrom ChinaBuy It Now