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Tinmo F688 Android Smartphone Running with Mediatek Chipset. So you Need MTK Smart Phone Flash Tool For This Device And This tool a free application for flashing Mtk device. this tools developed by mediatek company to improve their Mtk based smart phone. and also their user can use this tools using by upgrade firmware flash stock rom. you need scatter stock firmware and Mtk usb driver and some basic knowledge about how to flash with sp flash tool. check this article
There is no any phone which is not harm by rooting. So soon you will start using these tools. All apps will be install on your phone without any prior tool. If you want help that you can use without destroying your Android Phone. Just follow instructions.
Tinmo F900 update version 184.108.40.206 Include Firmware for all the Versions. This file will fix all the problems with the EMMC except when the error with the EMMC is compatibility issue of Pin Code or MAM. 7211a4ac4a