Regaining Access to WFC Kaeru – Pokémon SS

Hello.

I have an original Pokémon SS cartridge (Spanish version), and I could connect to the Kaeru server without any problems. A few months ago, I tried to play one day and got the message "your save file has been corrupted," and it wouldn't let me do anything. I read online that I could extract the save file (I used a modded 2DS), open it with PKHeX, save it, and reinsert it into the cartridge; I did this, and it worked perfectly. I don't remember if I reconnected to Kaeru after that. A few days ago, I was on vacation and played a bit; I have 100 hours of playtime.

I tried connecting to Kaeru, and I get error 61010. I also can't get a friend number because it tries to connect to give it to me, but it gives the same error. I've tried everything, like clearing the connection settings, ruling out a console problem (I can connect using my Pokémon HeartGold game), modifying the DNS, and using a different internet access point. I've tried using PKHeX to see if there's a value related to WFC, but I can't find it (the AI ​​says it exists, but it seems to be making things up).

Has anyone else experienced this? I know it's not the end of the world, and I can still transfer my Pokémon and restart the game (I extracted and saved my save file to my PC, started a new game, and it connects without problems, so it's a problem with the original save file, not the cartridge), but due to the time I've dedicated and the number of steps I've taken on the Pokéwalker (3 million), I'd like to keep the internet function for trading Pokémon. I tried asking on Discord, but I didn't get a solution.

Thank you.