Trying to install a custom ROM on Sony Xperia Z1 Compact

These are old notes. tl;dr - the bootloader was unlockable.

Custom ROM on phone

Rooting phone

https://forum.xda-developers.com/showthread.php?t=2631291&page=20
- is this particular version rootable easily?
recovery? unlocking bootloader? rooting?

https://www.addictivetips.com/mobile/what-is-bootloader-and-how-to-unlock-bootloader-on-android-phones-complete-guide/
In literal terms, bootloader is code that is executed before any Operating System starts to run.
Every Android phone has a bootloader that instructs the operating system kernel to boot normally
A bootloader is usually locked on an Android device
- because although it’s an open source OS, still the manufacturers want you to stick to their Android OS version specifically designed for the device.
- In order to apply this concept, manufacturers lock the bootloader.
- With a locked bootloader on Android devices, it is virtually impossible to flash a Custom ROM and forced attempts void warranty as well as usually end up in bricks.
- Therefore, the first step is to always unlock the bootloader.
- If you want root, you’d be wanting to flash Custom ROM post-root,
  - and if you want to install a Custom ROM, you’d need to have your stock bootloader unlocked.
  - In simple terms Unlocking the bootloader allows you to install custom Firmware on your Android phone.
http://www.theandroidsoul.com/how-to-unlock-bootloader-on-sony-xperia-z1-compact/
instructions to unlock bootloader
20/003/2017 00:03:19 - INFO - Loader : S1_Root₆₇₃₂ - Version : MSM8974₂₃ / Boot version : S1_Boot_MSM8974_Rhine1.3.1_LA1.04₁₆ / Bootloader status : NOT_ROOTABLE

Instructions here to get flashtool

I can't actually get latest most secure version of Android

📖 stoas

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