Rooting file for Gionee_A1.........
You don't root it with twrp OR any other mathods. Simply flash this image via fastboot command mention below
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fastboot oem unlock
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fastboot flash boot boot.img (boot.img link mention below)
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fastboot reboot
After these command your Gionee_A1 automatically erased all data which is stored in your mobile. Don't afraid , wait 5-7 min and mobile automatically booted after some time. Now install latest MagiskManage.apk and enjoy, your mobile now rooted.
This trick work properly 100% and your android does not brick or stuck in bootloop.