Secure os and boot

Anyone have a recommended way to secure the Android OS. To lock it down to boot directly into one app on startup (skipping all OS screens or hiding them) and also change the boot graphics to new logos? Also to do OTA secure OS and APP updates (even better be able to manage multiple instances or VIM3s).

If someone has experience or could help do this with the VIM3 please reach out. We could use an expert on our project and would be happy to workout a consulting agreement.

Thanks!

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