My current passprase decryption screen its just the manufacturer LOGO with a white text on the top: “Enter passprase for hd0,gpt2”. I believe that this is the default for everyone, i tried to change it for something more functional, something that show how many characters i typed or something. Tried to change the plymouth theme, the splash art while booting changed but not the actual passprase screen and the theme i installed has all the images that looks like passprase decryption screen. Need some help here.
This query is from bootloader (GRUB) which happens long before any Plymouth has chance to run. You cannot change the prompt. It displays the device UUID which gives some hint what it is about (you omitted this part). Unless you changed something manually this prompt is for the root device only (strictly speaking, for the device where /boot is located).
so there is no way to change it in a “user friendly way” or without risking to break the whole system? or there is no way to change it at all?
There is no way to change it without modifying the GRUB source code and adapting system management tools to actually use these modifications (i.e. record “user friendly name” in the GRUB configuration).