Bro click : HERE
As the U4 is not available, you can do with the U5 that is available, after you download the FIRMWARE U5 Shell is also available, if your phone has a network problem you can still downgrade the modem
If you want to upgrade, downgrade, or reinstall the operating system on your smartphone, you need to download a flash file. It can also resolve software issues, boot loop issues, IMEI issues, and dead issues.
If you want to upgrade, downgrade, or reinstall the operating system on your smartphone, you need to download a flash file. Get the latest lyf f90m flash file here.
