I just successfully updated to 9.1.0-20J using Tokiopop's setup and Syphurith's .cia unpacking script with the supposed 9.2.0-20J update files from the-site-that-must-not-be-named, and the process went quite smoothly. Honestly, the READMEs + having already read Yifan Lu's original post before...
You got a good chance of buying a used one and asking the seller how often they used or even ask for a picteof not updating just tell them don't update
@K3Nv2:
You got a good chance of buying a used one and asking the seller how often they used or even ask...