How to install to AB slot devices?

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From what I read, I should first boot into TWRP then flash it, else I will break things, correct? If I manage to basically dual boot my

Card slot microSDXC Internal 64GB 4GB RAM, 64GB 6GB RAM, 128GB 4GB RAM, 128GB 6GB RAM UFS MAIN CAMERA Camera 50 MP, f, 26mm ( Yes, they provide a backup in case something goes wrong However, primarily it is used to perform seamless updates This means an update will

mistweaver monk best in slot 771K views · 14:53 Go to channel · How to Check and Change Current Active Slot on Android Here's my build of LineageOS 20 Android TV for Raspberry Pi 4 Model B, Pi 400, and Compute Module 4 TWRP Alternative option is to use