So I got a more metal heatend, doesnt have an FTPE tube, it probably can go to 300 C safely, however, how do you increase max temp. Am I required to mess with firmware (its always such a hassle for those who dont work with software), or can one also do it with a gcode command.
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Hi @Boatmaster9001 and welcome to the forums.
As far as I am aware the hotend is limited to a maximum temperature of 260c which should be a high enough temperature for pretty much all filaments.
I am not sure if the printer configuration can be edited to increase this limit though.
Classically custom firmware was the solution, but that is kinda difficult. The second option was to increase it with gcode. I need mine a lil bit higher for ABS and a few other materials, the heatend is already good and the default temperature probe also can go to 300, my old v2 I managed to increase the temp with easily, so what options do we have here?
At the moment it does seem that there is a lack of custom firmware for the V3 SE most likely due to it being so new. Hopefully custom firmwares will start appearing soon and with any luck Creality may release a firmware update in the near future to allow higher temps.
The only other option I can think of right now is to maybe look at Klipper on the SE as you may find that with Klipper you are able to specify higher temps without having to keep compiling firmware etc. There are a couple of ways this could be done… you could use a Raspberry Pi running OctoPi or the easier option would be to grab a Sonic Pad which has presets for most printers already built in making setup even easier. Plus you would have direct access to the config files and be able to make changes on the fly 
Hope that helps.