Technician reported failure to follow procedures and downgrade the CAT Status prior to departure. The aircraft was correctly downgraded at the next station.

Narrative

On the day after performing maintenance on Aircraft X; I failed to downgrade the Category (CAT) status when making a maintenance update on the computer. The plane came in with an MEL that the FD1 had tripped when attempting to connect to ILS. The release instructed me to perform an ALS (Auto Landing System) Bite Test; record any faults present; then troubleshoot the fault prior to replacing any of the parts that it recommended might remedy the fault. I performed the AFS (Auto Flight System) Bite test per the Manual which reported one fault: 1 DYNROD CA (Captain)/FO (First Officer) FAILED.I then went back to the manual and found the steps to troubleshoot this fault; which led me to replacing the FCC 1 computer on the aircraft. Per manual instruction; I again performed the AFS Bite test; and the fault was still present. I then noted that the next step in troubleshooting would be to replace Dynamometric rod 69CA. Since ZZZ did not have the rod in stock; I could not go any further in troubleshooting the fault. Before making my entries in workbench; my coworker suggested we could sign off the current MEL and then create a new MEL for the place but being unsure of what steps needed to be taken; I suggested to him that I would call Maintenance Control to ensure we make the correct computer entries to which; he agreed. Before calling Maintenance Control; I wrote down all of the steps we had taken in troubleshooting the aircraft in an attempt not to leave anything out.At around XA:00 am I called Maintenance Control and told them everything we had done and what steps I had planned on taking to update the release in workbench to verify that they were in fact; the correct steps to take. Maintenance Control Technician advised to; in as great of detail as possible; updated the release with what actions that I had taken and that Maintenance Control would then recommend changing the Dynamometric Rod and find a home for the aircraft. The topic of the aircraft's CAT status was never broached by me nor the Maintenance Control Technician.It was not until another of my coworkers came in around XF:30 pm that the CAT status of the aircraft was mentioned. He reminded me that changing an FCC computer downgrades the CAT status of the aircraft until a qualified Mechanic performs a successful AFS Land Test. I told him that the CAT status was already downgraded because of the current MEL caused by the flight director. This; however; turned out not to be true. I had formed this assumption from when I was looking on the computer before the aircraft arrived at ZZZ from the note it had about the flight director MEL. I realize now that I never actually verified the current CAT status; which gave me no authority to speak on the matter. Firstly; I made the assumption that the CAT status had already been downgraded due the flight director fault I was working. Secondly; when I discussed the work I had performed with 3 of my coworkers and 1 Maintenance Control Technician; only one person brought up anything about CAT status change and none of them verified the aircraft had the proper CAT status prior to its departure at ZZZ. Having said that; the responsibility was mine and mine alone. Definitely Human Factors. Maybe some type of Pop up in the App that will not allow you to complete a sign off without downgrading CAT status when it knows that you've changed an item. I probably should have been more thorough in my communication with the Maintenance Control Technician by asking more questions. I am new to Line Maintenance but I have tried to build up a reputation as someone who is very thorough and detail-oriented in their work and that may have caused my coworkers not to question me further on that day. I doubt that will be a common occurrence moving forward because of this event.