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In order to support TWAIN applications with private capabilities, WIA drivers can use a technique known as pass-through functionality. The pass-through mechanism refers to the way a TWAIN-compatible application communicates with a WIA driver, using the data source manager and the TWAIN compatibility layer as intermediaries. It is important to note that TWAIN capability pass-through is supported only in Windows XP and later operating system versions.
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All communication between a TWAIN-compatible application and the WIA driver goes first to the data source manager (twain_32.dll), which in turn calls into the TWAIN compatibility layer (wiadss.dll). The TWAIN compatibility layer then calls the IWiaItemExtras::Escape method, which calls the IStiUSD::Escape method. The TWAIN compatibility layer calls only the IWiaItemExtras::Escape method. The driver developer should be concerned only with the device receiving an IStiUSD::Escape call. For more information about IWiaItemExtras::Escape, see the Microsoft Windows SDK documentation.
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In some rare conditionsTWAIN-compatible application software may not work properly after installation of the USB driver from the supplied CD-ROM. This problem may occur with software that has a function to constantly monitor TWAIN devices. Support for TWAIN-Compatible Applications.; 2 minutes to read Contributors. In this article. In order to support TWAIN applications with private capabilities, WIA drivers can use a technique known as pass-through functionality. The pass-through mechanism refers to the way a TWAIN-compatible application communicates with a.
Note The purpose of TWAIN pass-through functionality is to provide support to driver writers who are making the transition from TWAIN drivers to WIA drivers. It is not intended for the purpose of adding TWAIN features to a WIA driver. If your WIA driver does not require support for TWAIN, you should not add this functionality to your driver.
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After the software has been properly detected, Click on the Unlock button at the right side of the window and after a few minutes, your modem should be unlocked. 
When it loads up, Select unlocking on the right side of the window and you should see something as indicated in the image below. Unzip the unlocker software and launch the DC-Crap.exe file. Remove the modem from the computer and re-insert again and this time, you won’t be getting the invalid SIM display, instead, the sim will be detected and everything should work fine.