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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

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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.

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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. 

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