Then full steam ahead, my friend!no all my data got erased a long time ago
Alright. To get started, head over to 3ds.hacks.guide/ctrtransfer
Next, you'll want to download the CTRtransfer file for your system and region. NOTE: You'll have to use a torrent downloader
Once it's done downloading, place the ctrtransfer file on the SD card. (Probably the root, but anywhere is fine as long as you know where it's location is.) After that, put the SD card back into your 2DS. Startup Godmode9, navigate to your ctrtransfer file, select A on it, Select "CTRNAND Options" and finally select "Transfer image to CTRNAND. Input the combo when asked, and when finished, you should have a working 2DS on 11.5 from which you can update to 11.10. If this fails, your best bet would be to either talk to one of the Professionals like @TurdPooCharger or @zoogie or head over to the Nintendo Homebrew Discord.