How do I install TWRP?

[urbanspaceman]

I've attempted to install TWRP for days using the Android SDK platform tools in the command line, but no matter what I do the stock VollaOS recovery always gets reloaded. Here's what I've tried recently:

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>adb reboot bootloader

this puts the phone into fastboot. Erase the existing recovery:

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>fastboot erase recovery

make sure twrp.img is in the platform-tools folder

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>fastboot flash recovery twrp.img

reboot

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>fastboot boot twrp.img

When I hold the volume up and power buttons on reboot, it always goes back to the stock recovery. The messaging on the PC and phone screen all indicate the code being copied over, and there are no errors.