As a last resort, you can try re-uploading the existing 5.11.112 firmware to see if it works. Sometimes files in the config partition can become corrupted and re-uploading the existing firmware may fix it, thus allowing further updates to succeed.
If the first step is successful, you can then try uploading the latest firmware again.
If the first step is successful, but updating to the latest firmware version fails, incremental firmware updates may be required to reach the latest firmware version.
Otherwise, you’re stuck because using SSH and basic Linux commands is the ONLY remaining way to fix your problem.
