Just bought a new Xiaomi mi 6T device. My previous phone was a Sony Xperia m6. To unlock the bootloader and get root access was a bit of a pain on the latter. I remember having to backup a ta-partition to secure my DRM-keys.
Wanting to unlock the bootloader on this device I couldn't find any information about backing up and restoring a certain partition to secure the DRM-keys. What I did find was this post on the mi community forum about how unlocking the bootloader results in the widevine beïng downgraded from L1 to L3 (read the post for further details. The only way to reverse that process is to relock the bootloader again according to the the information I found.
So this is my question: Is there a way to keep the widevine L1 version, with better HDR performances, with an unlocked bootloader by backing up and restoring any data or partition on the phone that is responsible for widevine or other DRM content?
Wanting to unlock the bootloader on this device I couldn't find any information about backing up and restoring a certain partition to secure the DRM-keys. What I did find was this post on the mi community forum about how unlocking the bootloader results in the widevine beïng downgraded from L1 to L3 (read the post for further details. The only way to reverse that process is to relock the bootloader again according to the the information I found.
So this is my question: Is there a way to keep the widevine L1 version, with better HDR performances, with an unlocked bootloader by backing up and restoring any data or partition on the phone that is responsible for widevine or other DRM content?