I have 123scan version 4.3 Build 0.0 and the release notes show the 4070 as supported and it appears in the list of models. here is an extract of the release notes....

123Scan2 - List of Supported Scanners and Plug-ins
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Total plug-ins: 94
To search for a specific scanner model number within Notepad click 'Ctrl' and 'F' simultaneously.
To print this report click Help / Supported scanners and plug-ins.
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Plug-in          : CS4070-COMMON MODELS
Revisions        : CS4070-COMMON MODELS-005  (Firmware: CAACHS00-003-R00B1)
                   Supported Models : CS4070-HC0000BZMWW
                   CS4070-SR00004ZMWW
                   CS4070-SR00007ZMY

You should be able to pair the 4070 to your device, see the instructions in the Product Reference Guide or Quick Reference Guide at ...Symbol CS4070 Companion Scanner Support & Downloads | Zebra