ValentinBreiz and Vultra are the developers behind the Linux Loader payload, which allows for users to install Linux on their PS4's. They have now updated the payload to support 4.55 on certain PS4's.
Similar to the release of the 4.05 payload, only the Original "fat" PS4 and some of the PS4 slims are compatible with the release of this payload. The developers have made a list to check if your PS4 is compatible, you can check the tweet below to see if your PS4 is listed.
You can view and download the payload from the developer's GitHub here.
The instructions on how to install and run, are found in the project's readme, some of which has been quoted below:
For now only some PS4 FAT models are supported, see the list here.
You need a FAT32 formatted USB drive plugged in any PS4's USB port with the following files on the root directory: bzImage and initramfs.cpio.gz. You can download them here.
Then you will need to send the payload (PS4-Linux-Loader.bin) to your PS4. For that go to your PS4 web browser, send the payload to your PS4 using netcat or other.. (You can alse use my tool: PS4 Payload Sender).
PS4 users interested in getting Linux on their consoles should look into more details that can be found on the developer's GitHub to decide if you want to try it out or not.