Z18 NO Android 11

Please help someone! I have a Z18. I love this. But it’s Android 8.1.0. Blloc is v4.0.1. How can you make Android 11? I’ve tried it many times, but I can’t. 11 I’m tired. … … I put the file in the SD card and did Apply update from SD card ’, but nothing changed. I am Japanese and translate to Japanese with a translation tool. Please tell me how to make Android 11 easier to understand.

This is what i found on the HowTo page hope it helps

thank you. But even if you do this street, it will not be Android 11. … …