how to unlock huawei e173-u

1-first 1 install modem dashboard after install download QPST configuration here>>>>>>
download QPST here
after install  open qpst  folder from start menu then  qpst configuration  make sure moderm is plugged in
- Then click on Add new port.. the one you note down

-Uncheck "show  serial and USB/QS Diagnostic port only.
-If you selected the correct port then it will shown phone if has no phone is not correct

-Then on the Tab click on Start clients then choose software Download

-now press backup tab then backup when complet  quit qpst


2.) Downgrade your modem using the Huawei Flasher.
huawei flasher
• Plug your modem to your PC.
• Close the dashboard.
• Run Huawei Flasher (NOTE: You must have a working Internet Connection)
• After that your modem port will be detected

Then look on the tab then click "select Firmware" , Then choose "Extract from EXE"  Then locate Firmware file E1731Update_ and click ok
-then Uncheck 05.bin                                                                                                                                - Then On the tab choose "Flash Modem"  then choose "normal mode" then wait till the box promt up and press OK after modem entered on download mode 
-Remember you will get error on 07.bin. don worry, wait for while then it will finish 

-Configuration then add COM port > software download insted of click back up tab, click on restore tab then click browse then locate the file you created Backup (7 stage) then click start and wait for while and it will finish 
now unlock succes then unstall modem dashboard and install again