For everyone who wants to remove the fingerprint animation, that greatly decreases the time to unlock the device, you just have to:
1 - Install the app Settings Database Editor
2 - Open the app
3 - Touch on "+ Add new setting"
4 - ...
There's a guide already on XDA that covers this matter but in a general way and for all devices. That guide was based on the general info you may find on the original installation guide by topjohnwu. So, all credits go to him.
On this thread we could keep a list of all fastboot ROMs that can be used to flash into Mi A3.
Version build number explained:
10.3.4.0 - Firmware version
P - Android version (P-> Pie / Android 9).
A "themed custom ROM" based on stock XXMA3 firmware released in Spain on February of 2013.
Please, Nik001, update the OP with the install method that I'm going to describe next, ok?
It's just to avoid future complications (lost of Wi-Fi, sound, etc...) for "not that experienced users".
Your bootloader must be unlocked. If it...