I bought (Alps N720) Model: N907 at AliExpress,
Build Nr: A100_72KK_3GW_EMMC_32_4_QHD_TT_N907_20150321.103906
with Android Version: 4.4.2
Problem: I discovered that after the Factory Reset Win7 USB was able to connect. Yet after reinstall of all apps, I suddenly got: “Unfortunately… system ui stopped!
I still can get into Settings, but the Factory Reset now does not reset the phone.
What to do??????? Please help me to find a solution. Thank you in advance…. Joh
I bought (Alps N720) Model: N907 at AliExpress,
Build Nr: A100_72KK_3GW_EMMC_32_4_QHD_TT_N907_20150321.103906
with Android Version: 4.4.2
Problem: No USB mode. Win7 claims: USB Device not recognized (see Pic)
I followed d/l these drivers, but it only installed the “Android Composite ADB Interface” and Win7 still claims: “USB Device not recognized…”
Is there something else to adjust on this phone to get it booting into USB or see the phone’s content on my Win7 ??
I also rooted it successfully with Kingo Root, installed SuperSu and Neo Busybox.
Thank you for your good advice. 
Greetings from young pensioner (75) Joh in St’go de Chile