1. You need to uninstall Play store Telegram X.
2. Install TGx Themed of your choice.
3. Updates should be seemless, no need to uninstall after that.
All apks include two variants of themes as shown in screenshots below, choose between night black and night blue in settings/themes of telegram X
One build for both arm/arm64
**- DarkMaterial Reborn
**- DeepDarkness Venom
All Download links :