so today i upgraded from mocha to cbhc and i still want to stay on 5.5.1 for reasons is it still possible to delete the update folder in sysNand with cbhc
yes, it's possible.
just use the latest version of ftpiiu_everywhere (it has been updated to work with CBHC too, instead of just mocha). https://github.com/FIX94/ftpiiu/releases