Kindle Scribe - Tried to Jailbreak and now stuck in Managed Mode

Hi,

I have a Kindle (on 5.16.2.0.1) that I have jailbreak following the guide https://github.com/notmarek/LanguageBreak


I did the jailbreak while the device was not registered to Amazon AND in airplane mode. I believe I have done everything (I got a mkk folder on the USB Drive).
Now, the device is in the screen where it ask me to register. I can't find a way to leave that screen without registering. AND I cannot register because the device is in manage mode, so when I try to register it says I can't because airplane mode which cannot be deactivated because I am in managed mode.

Anyone has any idea how to bypass that screen? I would prefer to keep the device un-registered but if it needs to be registered, I will survive :D

Thanks for the help