I need help/tips on how to remove the speed limiter through the Bluelight app, if there’s any guide or something similar. Mine only goes 25 km/h, but I’d like to increase it to 40 km/h or something like that. If anyone has a tip, that would be great!
It's likely that you'd have to replace the controller/etc in there with an unrestricted one, not just because the restriction probably can't be bypassed, but also that going that much faster is probably going to double (or more) your power consumption, so the controller probably can't put out that much more power.
Also, the motor may get hot (or overheat) and the battery will probably not support outputting more power than it was designed for. (even if it does, and isn't stressed or damaged by it over time, it will then have only half or less the range that it did before).
Replacing the controller usually also means replacing the display and possibly controls, depending on how integrated they are with the original controller (most system parts are not intercompatible with different systems on these things). Sometimes even the battery and charger don't work with anything other than the original.
Keep in mind that these restrictions are usually there for local legal reasons, and bypassing them can have legal consequences for the rider, depending on local enforcement.