Help [Honor 200 Lite - LLY-NX1] Error 0xC0020053

[raph1233]

Hello
I got this Honor device, it's in demo mode (vendor/contry = demo/eueea)

I want to remove the demo mode, my first attempt was to flash a stock firmware
At first it was running Android 14, I flashed an Android 15 firmware, but the demo mode didn't go away.

Then I've tried these tools:

• GitHub - bkerler/mtkclient: MTK reverse engineering and flash tool
• GitHub - shomykohai/penumbra: MTK flash tool core written in rust

Using some custom DA file called DA_PL_M6833_HONOR.bin, coming from some "AMT" tool apparently
And I got this error:

DA version Anti-Rollback error (0xc0020053)

Then I've downgraded to Android 14 the same way I updated (dload method), but the error remains, here are my device details now:



I've just paid the tool "unlocktool" to try, but I get the same error code:



What is wrong?

 

[raph1233]

Did some anti rollback protection remained even after the downgrade? Or March 2024 is too high already?
Would using test point fix it?