After the Android 5.0 LRX21P is installed on your Nexus 7 2012 Wi - Fi tablet you can re-lock the bootloader in case you're not
planning on rooting the device: fastboot oem lock
If you are
planning on rooting your device, then you can use various apps that can trigger Download Mode boot right from your Galaxy S8 screen.
After the Android 5.0 LRX21P is installed on your Nexus 7 2012 Wi - Fi tablet you can re-lock the bootloader in case you're not
planning on rooting the device: fastboot oem lock
Not exact matches
If you are doing this just to send your
device in for repairs and
plan on using it again once it is returned to you, then you may consider creating a nandroid to return your
rooted device back to its current settings, but if you are going to switch
devices, you can simply use ADB to back up your data.
That said, the following list is a great place to start if you're
planning on rooting your next
device.
Rooting your
device is not that hard, but you should only do it in case you're
planning on customizing its ROM or flashing any new custom Recoveries or kernels.
You should only
root your
device in case you're
planning on tinkering with its entire system and in case you want to profit from the unlimited possibilities that will allow you to customize your phone.