MobileRead Forums - View Single Post - K4 This device is not authorised as a test kindle

dryes · 03-20-2025, 03:47 AM

You have to downgrade with Kubrick to firmware 4.1.1. The required firmware is included in the Kubrick iso.

Had it on 4.1.3 and got "This device is not authorised as a test kindle". Aftre downgrading it worked but I had to reinstall some packages so KUAL would start again.

The downgrade didn't delete any data but it stopped KUAL and I think also some kindlets from working, so I had to reinstall some stuff.

I had already installed Back Door Lock previously, and maybe reinstalled that. Didn't try without it activated so I don't know if it's needed.

03-20-2025, 03:47 AM	#3
dryes Junior Member Posts: 4 Karma: 10 Join Date: Mar 2025 Device: kndle4nt	You have to downgrade with Kubrick to firmware 4.1.1. The required firmware is included in the Kubrick iso. Had it on 4.1.3 and got "This device is not authorised as a test kindle". Aftre downgrading it worked but I had to reinstall some packages so KUAL would start again. The downgrade didn't delete any data but it stopped KUAL and I think also some kindlets from working, so I had to reinstall some stuff. I had already installed Back Door Lock previously, and maybe reinstalled that. Didn't try without it activated so I don't know if it's needed. Last edited by dryes; 03-20-2025 at 03:51 AM.