Any way to remove Chinese text "google key tee key" water mark?

I've never seen anything like that before. But it looks like it's been built-in (baked in) that particular custom ROM. Where or how, no idea.

Maybe try a different custom ROM, that's suitable for your phone, or try and contact the dev who built that ROM?

 

Which screens does this message appear on? I'm guessing that's a lock screen in the image, but does it appear on others? That might give a clue as to the source.

 

Hmm, so it's a screen overlay of some sort.

Crazy thought: check in developer options to see whether there's anything there. There are usually things that can produce informational overlays in there, though I've never seen anything like that. Otherwise it's perhaps some app the dev included in the ROM, but as you say the problem is guessing which (hopefully not something added to a core system component, because why would anyone want this?).

 

I have never seen like that but My friend is also facing the issue if you found any method to solve this let me know

 

That's reallt weird, how couldn't you not remove it ?!

 

I know of a fix. First you have to download minimal ADB and fastboot on your computer. Then plug in your phone into the computer but keep the phone on. Next on the computer press windows key and R and type CMD
Next put in these commands
adb devices
adb shell
pm list packages
pm uninstall --user 0 com.mediatek.factorymode
Then restart your phone and it will the remove the writing.