Hi friends, we had volte problem with new update, old PDC method gives error. I saw another method in a few places, before me there was post about it, but was so complicated for read. On 4pda site was written so easy., if you know how to use command director on windows, it is not a troublesome process.
Step 1: Download
https://4pda.ru/pages/go/?u=https:/...EfsTools-0.10-modded-1.2-win32.zip&e=97287430 and
https://drive.google.com/file/d/1PiVhB35MPx19sxqxQ4svgOvPXL1dxobt/view open both to a same new folder on the desktop.
Step 2: than dial * # 801 # and turn the serial and full port switch buttons on and connect the phone to the computer.
Step 3: In the lower left corner of the screen, the command directory appears in the search as CMD. Type "cd desktop" into the current directory, you switch to the desktop, if you know the name of the folder you opened, type "cd (folder name)", going into the folder, write "
EfsTools.exe efsInfo", you can copy and paste it. When you press enter, the port number and some text are displayed on the screen.
Step 4: then we close the mcfg file: write "
EfsTools.exe writeFile -i mcfg_autoselect_by_uim -o / nv / item_files / mcfg / mcfg_autoselect_by_uim " into this script and press enter, then write it: "
EfsTools.exe writeFile -i mcfg_a_u_a_a_a_select / nv / item_files / mcfg / mcfg_autoselect_by_uim -s 1 "
Step 5: Download
https://drive.google.com/file/d/1Unr8reL3_nLJK9hBs85huXdV_HBXKjaf/view?usp=sharing file and open it in the previous efs folder.
Step 6: We write this in the "
EfsTools.exe uploadDirectory -i mcfg_sw.mbn -o / -v " directory and press enter.
Also for the 2nd sim
write "
EfsTools.exe uploadDirectory -i mcfg_sw.mbn -o / -s 1 ".
voila. go to the phone to recovery, make wipe cache and reboot. Wait a while when it is fully open, the volte text will appears, if not, try the same steps with another usb port, i do it on first try.
i have no root, no bootloader open.