As of now, . Your safest bet is to avoid updating, monitor developer channels, and use Lua scripting in the meantime. The Ndless team has never failed to deliver eventually, but OS 5.4 is proving to be one of the toughest challenges since the original CX lockout in 2013.
: Users on OS 5.4 or higher cannot downgrade to 5.3 using official software, as the calculator returns an "error: you cannot install a version of the OS that is older than the currently installed version". ndless for 5.4
