Can't get out of Kindle Demo mode on K4

Hi, I was trying to JB using the languagebreak method. However I did not suceed, and now I am stuck in this demo mode with chinease langauge. Whatver I do, I just can not exist this demo mode.
Things I have tried
1) enter_demo then restart then ;demo and the resell device, but after this again i am booted into chinease demo mode
2) reset device
3) flashed english hotfix file


Version 5.16.2.1.1