@lucasrato,
Yeah, you are essentially safe! Just make sure NOT to install the 5.12.x firmware.
Let me get a direct link to 5.11.x for you (currently there is only the latest 5.12.x available for direct download, but you can just change the numbers in the end of the download link):
https://s3.amazonaws.com/firmwaredow...ite_5.11.2.bin
Again, make sure to install the hotfix right after you update!
Then reinstall all packages you already have to make them work.