Use this method only if downgrade option via fastboot & rescue recovery  failed!

Download DC Phoenix software here

Step 1

Launch the program

If there is no DC-Unlocker/Rocker/Vygis or Infinity dongle connected to PC, then log in screen will appear. Use your account details to log in

Don't have user account? How to get Username/Password check here

Step 2

DC Phoenix software window will appear

Step 3

Connect phone to PC via testpoint. It must be visible under Ports section in device manager as HUAWEI USB COM 1.0

Step 4

On DC-Phoenix click file select icon and choose special downgrade board software which will have "Downgrade" word in it's file name.

To download this board software visit DC-phoenix support area which is only accessed directly from software by pressing "Download file" button.

Step 5

Then can press "Update"

Step 6

Monitor flashing process, phone will enter fastboot soon after flashing begins, it must appear as example below, otherwise flashing device will fail:

If all done correctly flashing will continue

Step 7

Wait till software indicates flashing process completion

IMPORTANT

Now you can disconnect and boot the mobile. After this downgrade, phone can be repaired on HCU (IMEI/SN etc.) and flashed back with stock rom (with new security R1) afterwards to restore to its normal state.