https://github.com/Plailect/Guide/wiki/Part-4-(2.1.0-Downgrade)
i am at section 2 step 9.
Open PlaiSysUpdater on RedNAND
i was confused from there, i thought i can run plaisysupdater on homebrew browser
i did on downgrade on homebrew brower, it ran smooth and then there was a error message...