How to install a different operating system on an Android Phone

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Boot into recovery

Download the TWRP Recovery for your device or the recovery that came with your custom ROM.
Enter the command fastboot boot [directory]\[filenameOfTheRecovery].img and wait until your device has rebooted into recovery mode.
On some devices you might need to enter the command fastboot flash boot [directory]\[filenameOfTheRecovery].img and fastboot reboot recovery instead.

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