LeminLimez, lead developer of Nugget and Pocket Poster, shared a post suggesting that it would be possible to have custom CarPlay wallpapers using Pocket Poster without jailbreaking.
Implementing this hack would require a separate app hash and could be somewhat tedious but does work, allowing customization without a jailbreak.
While this feature only supports still images and not video wallpapers, the fact that it's achievable without jailbreaking is noteworthy.
The process involves editing caches, something Pocket Poster can do while Nugget cannot.
Support for different iOS versions may vary due to differences in wallpaper names.
The custom wallpaper is limited to images and cannot include videos.
The exact iOS versions supported by this feature remain uncertain as different versions use varying wallpaper names.
There is a possibility of LeminLimez making this a public feature in the future, with further updates by iDownloadBlog team.
This hack brings an exciting customization opportunity for CarPlay users who prefer not to jailbreak their devices.